Stock Compensation Plans - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified |
12 Months Ended | |||
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2013
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Mar. 31, 2016
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Stock option awards granted | 49,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | |||
Weighted average fair value of options granted | $ 4.97us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | |||
Cash proceeds from the exercise of stock options | $ 47us-gaap_ProceedsFromStockOptionsExercised | $ 581us-gaap_ProceedsFromStockOptionsExercised | $ 83us-gaap_ProceedsFromStockOptionsExercised | |
Total intrinsic value of the stock options exercised | 32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 1,221us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 203us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | |
Unrecognized stock-based compensation expense | 1,055us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized | |||
Weighted average period for recognize expense | 1 year 5 months 9 days | |||
Options, stock awards and performance awards available for future grants | 403,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant | |||
Stock Compensation Plan [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Stock based compensation expense |
598us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
582us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
524us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
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Income tax benefit to stock based compensation |
210us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
205us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
184us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
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Increase in capital in excess of par value for the income tax benefit realized upon exercise of stock options and vesting of restricted |
197us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
268us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
41us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
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Restricted Stock [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Restricted stock awarded |
30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
32,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
26,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
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Employee Stock Option [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Stock options maximum term | 10 years | |||
Stock option awards granted |
49,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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Share-based compensation vesting percentage |
33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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Vesting period | 3 years | |||
Amended and Restated 2000 Incentive Plan [Member] | Stock Compensation Plan [Member] | Maximum [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Number of shares authorized |
1,375,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
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Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Restricted stock awarded |
30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember |
32,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember |
26,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember |
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Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member] | Performance Vested Restricted Stock [Member] | Officer [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Share-based compensation vesting percentage |
100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember / us-gaap_VestingAxis = ghm_PerformanceVestedRestrictedStockMember |
100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember / us-gaap_VestingAxis = ghm_PerformanceVestedRestrictedStockMember |
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Vesting period | 3 years | 3 years | ||
Restricted stock awarded |
12,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember / us-gaap_VestingAxis = ghm_PerformanceVestedRestrictedStockMember |
14,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember / us-gaap_VestingAxis = ghm_PerformanceVestedRestrictedStockMember |
18,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember / us-gaap_VestingAxis = ghm_PerformanceVestedRestrictedStockMember |
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Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member] | Time Vested Restricted Stock [Member] | Officers and Key Employees [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Share-based compensation vesting percentage |
33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_TitleOfIndividualAxis = ghm_OfficersAndKeyEmployeesMember / us-gaap_VestingAxis = ghm_TimeVestedRestrictedStockMember |
33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_TitleOfIndividualAxis = ghm_OfficersAndKeyEmployeesMember / us-gaap_VestingAxis = ghm_TimeVestedRestrictedStockMember |
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Vesting period | 3 years | 3 years | ||
Restricted stock awarded |
11,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_TitleOfIndividualAxis = ghm_OfficersAndKeyEmployeesMember / us-gaap_VestingAxis = ghm_TimeVestedRestrictedStockMember |
12,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_TitleOfIndividualAxis = ghm_OfficersAndKeyEmployeesMember / us-gaap_VestingAxis = ghm_TimeVestedRestrictedStockMember |
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Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member] | Time Vested Restricted Stock [Member] | Director [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Share-based compensation vesting percentage |
100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember / us-gaap_VestingAxis = ghm_TimeVestedRestrictedStockMember |
100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember / us-gaap_VestingAxis = ghm_TimeVestedRestrictedStockMember |
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Vesting period | 1 year | 1 year | ||
Restricted stock awarded |
7,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember / us-gaap_VestingAxis = ghm_TimeVestedRestrictedStockMember |
6,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember / us-gaap_VestingAxis = ghm_TimeVestedRestrictedStockMember |
8,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember / us-gaap_VestingAxis = ghm_TimeVestedRestrictedStockMember |
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Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member] | Maximum [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Number of shares authorized |
250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ghm_AmendedAndRestated2000IncentivePlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
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Long Term Incentive Plan [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Amounts paid to participant |
157us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid / us-gaap_PlanNameAxis = ghm_LongTermIncentivePlanMember |
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Long Term Incentive Plan [Member] | Director [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Related liability recorded under plan |
158us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_PlanNameAxis = ghm_LongTermIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |
315us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_PlanNameAxis = ghm_LongTermIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |
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Long Term Incentive Plan [Member] | Subsequent Event [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Amounts paid to participant |
158us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid / us-gaap_PlanNameAxis = ghm_LongTermIncentivePlanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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Employee Stock Purchase Plan [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Number of shares authorized |
200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = ghm_EmployeeStockPurchasePlanMember |
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Stock based compensation expense |
55us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = ghm_EmployeeStockPurchasePlanMember |
57us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = ghm_EmployeeStockPurchasePlanMember |
52us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = ghm_EmployeeStockPurchasePlanMember |
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Income tax benefit to stock based compensation |
19us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_PlanNameAxis = ghm_EmployeeStockPurchasePlanMember |
20us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_PlanNameAxis = ghm_EmployeeStockPurchasePlanMember |
19us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_PlanNameAxis = ghm_EmployeeStockPurchasePlanMember |
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Increase in capital in excess of par value for the income tax benefit realized upon exercise of stock options and vesting of restricted |
$ 3us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / us-gaap_PlanNameAxis = ghm_EmployeeStockPurchasePlanMember |
$ 3us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / us-gaap_PlanNameAxis = ghm_EmployeeStockPurchasePlanMember |
$ 2us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / us-gaap_PlanNameAxis = ghm_EmployeeStockPurchasePlanMember |
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Discounted purchase price of common stock percentage on fair market value |
85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_PlanNameAxis = ghm_EmployeeStockPurchasePlanMember |
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Issue of treasury stock to the ESPP for the offering periods |
12,000ghm_SharesPurchasedByEmployeeStockPurchasePlan / us-gaap_PlanNameAxis = ghm_EmployeeStockPurchasePlanMember |
16,000ghm_SharesPurchasedByEmployeeStockPurchasePlan / us-gaap_PlanNameAxis = ghm_EmployeeStockPurchasePlanMember |
19,000ghm_SharesPurchasedByEmployeeStockPurchasePlan / us-gaap_PlanNameAxis = ghm_EmployeeStockPurchasePlanMember |
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- Definition
The number of shares purchased during the period by the Employee Stock Purchase Plan. No definition available.
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- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The amount of distributions made to the individual during the period. No definition available.
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- Definition
Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements. No definition available.
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- Definition
Unrecognized cost of unvested share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of vesting of share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Gross number of share options (or share units) granted during the period. No definition available.
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Purchase price of common stock expressed as a percentage of its fair value. No definition available.
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