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Leases (narrative) (detail) (USD $)
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Operating Leases, Rent Expense, Net [Abstract]      
Operating Leases, Rent Expense $ 49,600,000us-gaap_LeaseAndRentalExpense $ 43,900,000us-gaap_LeaseAndRentalExpense $ 38,100,000us-gaap_LeaseAndRentalExpense