Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Summary of Amounts Recognized in Accumulated Other Comprehensive Loss, Net of Income Tax (Detail)

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Employee Benefit Plans - Summary of Amounts Recognized in Accumulated Other Comprehensive Loss, Net of Income Tax (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Pension Plans, Defined Benefit [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss $ 5,939 $ 8,278  
Prior service cost 2 5  
Total 5,941 8,283 8,515
Other Postretirement Benefit Plans [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss 295 336  
Prior service cost (68) (176)  
Total $ 227 $ 160 $ 20