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Schedule of Net Periodic Benefit Cost (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Pension Plan and Supplemental Plan
       
Net Period Benefit Cost Assumptions [Line Items]        
Service cost $ 198 $ 273 $ 396 $ 546
Interest cost 895 1,072 1,790 2,144
Expected return on plan assets (718) (687) (1,436) (1,374)
Amortization of prior service cost 12 12 24 24
Recognized actuarial (gain) loss 276 448 552 896
Net periodic benefit cost 663 1,118 1,326 2,236
Other Benefits
       
Net Period Benefit Cost Assumptions [Line Items]        
Service cost 101 119 202 238
Interest cost 262 309 524 618
Amortization of prior service cost (508) (508) (1,016) (1,016)
Recognized actuarial (gain) loss (99)   (198)  
Net periodic benefit cost $ (244) $ (80) $ (488) $ (160)