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Schedule of Other Changes in Plan Assets and Benefit Obligation Recognized (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Pension Plans, Defined Benefit
    
Schedule Of Accumulated Benefit Obligations In Excess Of Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet And In Other Comprehensive Income Loss [Line Items]    
Net loss (gain) $ (2,196) $ 3,954
Settlement loss   (5,161)
Amortization of prior service cost (50) (50)
Amortization of net (loss) gain (1,103) (1,648)
Total recognized in other comprehensive income (loss) (3,349) (2,905)
Net of 35% tax rate (2,177) (1,888)
Other Pension Plans, Defined Benefit
    
Schedule Of Accumulated Benefit Obligations In Excess Of Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet And In Other Comprehensive Income Loss [Line Items]    
Net loss (gain) (5,793) (1,708)
Amortization of prior service cost 2,032 2,032
Amortization of net (loss) gain 395  
Other 197 (643)
Total recognized in other comprehensive income (loss) (3,169) (319)
Net of 35% tax rate $ (2,060) $ (207)