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Cash Flow Information - Supplemental - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Supplemental Cash Flow Elements [Abstract]    
Cash payments made for interest $ 14.6 $ 6.8
Net payments made for federal and state income taxes 52.4 $ 39.3
Non-cash investing activities related to fixed asset additions $ 5.2