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Sale Leaseback Arrangements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sale Leaseback Transaction [Line Items]        
Deferred gains on sale/leaseback transactions $ 5.8 $ 3.7 $ 11.7 $ 7.4