Annual report pursuant to Section 13 and 15(d)

Stock Compensation Plans - Additional Information (Detail)

v2.4.0.8
Stock Compensation Plans - Additional Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Installment
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option awards granted   49 9
Weighted average fair value of options granted   $ 4.97 $ 9.51
Cash proceeds from the exercise of stock options $ 581 $ 83 $ 386
Total intrinsic value of the stock options exercised 1,221 203 776
Unrecognized stock-based compensation expense 1,000    
Weighted average period for recognize expense 1 year 5 months 19 days    
Options, stock awards and performance awards available for future grants 423    
Number of installment 2    
Long Term Incentive Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation expense 0 10 20
Common stock to award unit ratio 1    
Minimum service period of director 5 years    
Minimum percentage of approved budgeted net income 100.00%    
Maximum stock price per unit consider for calculating compensation cost $ 3.20    
Number of share equivalent units outstanding under plan   43  
Expense (income) to mark to market the share equivalent units 6 2 (2)
Director [Member] | Long Term Incentive Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Related liability recorded under plan 315 310  
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 1,375    
Outstanding options expiry date range 2022-05    
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding options expiry date range 2016-06    
Restricted Stock Units (RSUs) [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 250    
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 0 49 9
Share-based compensation vesting percentage 33.33%    
Vesting period 3 years    
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards 32 26 32
Restricted Stock [Member] | Performance Vested Restricted Stock [Member] | Officer [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards 14 18 16
Percentage of performance shares vested on third anniversary of grant date 100.00%    
Restricted Stock [Member] | Time Vested Restricted Stock [Member] | Officer [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards     7
Percentage of time vested shares vested on second and fourth anniversary of grant date     50.00%
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%    
Vesting period 3 years    
Restricted stock awards 12    
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%    
Restricted stock awards 6 8 9
Stock Compensation Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation expense 582 524 556
Income tax benefit to stock based compensation 205 184 198
Increase in capital in excess of par value for the income tax benefit realized upon exercise of stock options and vesting of restricted 268 41 244
Employee Stock Purchase Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation expense 57 52 55
Income tax benefit to stock based compensation 20 19 19
Increase in capital in excess of par value for the income tax benefit realized upon exercise of stock options and vesting of restricted $ 3 $ 2 $ 3
Discounted purchase price of common stock percentage on fair market value 85.00%    
Shares approved for purchase under ESPP 200    
Issue of treasury stock to the ESPP for the offering periods 16 19 19