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Leases (narrative) (detail) - USD ($)
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Operating Leases, Rent Expense, Net [Abstract]      
Operating Leases, Rent Expense $ 51,400,000 $ 49,600,000 $ 43,900,000
Capital Leased Assets [Line Items]      
Property, plant and equipment issued under capital lease 5,313,000    
Less accumulated amortizaion 89,000    
Building [Member]      
Capital Leased Assets [Line Items]      
Property, plant and equipment issued under capital lease $ 5,313,000    
Capital Lease Obligations [Member]      
Debt Instrument Interest Rate Effective Percentage [Abstract]      
Capital lease interest rate 5.20%