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Change in Plan Assets and Obligations (Detail) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2013
Pension Plans, Defined Benefit
Mar. 31, 2012
Pension Plans, Defined Benefit
Mar. 31, 2014
Pension Plans, Defined Benefit
Mar. 31, 2014
Pension Plans, Defined Benefit
Change in Benefit Obligations
Mar. 31, 2013
Pension Plans, Defined Benefit
Change in Benefit Obligations
Mar. 31, 2014
Pension Plans, Defined Benefit
Change in Plan Assets
Mar. 31, 2013
Pension Plans, Defined Benefit
Change in Plan Assets
Mar. 31, 2014
Pension Plans, Defined Benefit
Reconciliation of Funded Status
Mar. 31, 2013
Pension Plans, Defined Benefit
Reconciliation of Funded Status
Mar. 31, 2014
Other Pension Plans, Defined Benefit
Mar. 31, 2013
Other Pension Plans, Defined Benefit
Mar. 31, 2014
Other Pension Plans, Defined Benefit
Change in Benefit Obligations
Mar. 31, 2013
Other Pension Plans, Defined Benefit
Change in Benefit Obligations
Mar. 31, 2014
Other Pension Plans, Defined Benefit
Change in Plan Assets
Mar. 31, 2013
Other Pension Plans, Defined Benefit
Change in Plan Assets
Mar. 31, 2014
Other Pension Plans, Defined Benefit
Reconciliation of Funded Status
Mar. 31, 2013
Other Pension Plans, Defined Benefit
Reconciliation of Funded Status
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]                                      
Benefit obligation at beginning of year $ 84,067,000 $ 88,238,000       $ 88,238,000 $ 93,356,000     $ 84,067,000 $ 88,238,000     $ 29,006,000 $ 29,262,000     $ 24,114,000 $ 29,006,000
Fair value of plan assets at beginning of year 56,896,000 59,431,000     (56,002,000)     59,431,000 56,917,000 56,896,000 59,431,000                
Fair value of plan assets 56,896,000 59,431,000 (58,524,000)   (56,002,000)     56,896,000 59,431,000 56,896,000 59,431,000                
Service cost           790,000 983,000             405,000 475,000        
Actual return               776,000 5,605,000                    
Benefit obligation 84,067,000 88,238,000       84,067,000 88,238,000     84,067,000 88,238,000     24,114,000 29,006,000     24,114,000 29,006,000
Interest cost           3,581,000 4,098,000             1,048,000 1,235,000        
Employer contributions     0 0       939,000 13,920,000             552,000 258,000    
Unfunded status                   (27,171,000) (28,807,000)             (24,114,000) (29,006,000)
Participant contributions                           436,000 428,000 436,000 428,000    
ERRP reimbursement                           (26,000) 274,000 (26,000) 274,000    
Plan settlement             (13,046,000)   (13,046,000)                    
Benefits paid           (4,250,000) (3,965,000) (4,250,000) (3,965,000)         (962,000) (960,000) (962,000) (960,000)    
Actuarial (gain) loss           (4,292,000) 6,812,000             (5,793,000) (1,708,000)        
Fair value of plan assets at end of year 56,896,000 59,431,000 (58,524,000)   (56,002,000)     56,896,000 59,431,000 56,896,000 59,431,000                
Benefit obligation at end of year 84,067,000 88,238,000       84,067,000 88,238,000     84,067,000 88,238,000     24,114,000 29,006,000     24,114,000 29,006,000
Current liabilities     (1,070,000)   (1,162,000)             (1,129,000) (1,329,000)            
Noncurrent liabilities     (27,737,000)   (26,009,000)             (22,985,000) (27,677,000)            
Net amount recognized     $ (28,807,000)   $ (27,171,000)             $ (24,114,000) $ (29,006,000)