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Schedule of Other Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Mar. 31, 2013
Other Assets, Accrued Expenses, Other Current Liabilities, And Other Liabilities And Deferred Credits [Abstract]    
Recoverable insurance losses $ 9,870 $ 10,833
Deferred income tax assets 82,328 73,105
Deferred finance charges 8,161 5,133
Savings plans and supplemental plan 22,026 23,149
Noncurrent tax receivable 9,106 9,106
Other 17,748 4,951
Total other assets $ 149,239 $ 126,277