Income Taxes - Reconciliation of the Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
Mar. 31, 2018 |
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| Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract] | |||
| Provision (benefit) for income taxes at federal rate | $ 486 | $ (30) | $ (3,958) |
| State taxes | 120 | 45 | 118 |
| Charges not deductible for income tax purposes | 55 | 89 | 48 |
| Research and development tax credits | (211) | (177) | (102) |
| Valuation allowance | 411 | 3,877 | (80) |
| Difference in federal rate | (1) | 3 | (2,799) |
| Impairment of goodwill and intangible assets | 257 | 1,760 | |
| Foreign-derived intangible income deduction | (95) | (69) | |
| Capital loss from sale of Energy Steel | (325) | (3,848) | |
| Stranded tax effects in accumulated other comprehensive loss | 1,828 | ||
| Mandatory repatriation of post-1986 undistributed foreign subsidiary earnings and profits | 185 | ||
| Other | 16 | (10) | |
| Total provision (benefit) for income taxes | $ 440 | $ 163 | $ (3,010) |
| X | ||||||||||
- Definition Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the capital loss from sale of stock in subsidiary. No definition available.
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- Definition Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for foreign-derived intangible income. No definition available.
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the impairment of goodwill and intangible assets. No definition available.
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the mandatory repatriation of post-1986 undistributed foreign subsidiary earnings and profits. No definition available.
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| X | ||||||||||
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the stranded tax effects in accumulated other comprehensive loss. No definition available.
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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