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Schedule of Total Selling, General and Administrative Expenses (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Accounting Policies [Abstract]      
Operating Units Selling, G&A $ 62,529 $ 57,004 $ 56,110
Corporate G&A 41,205 33,940 37,193
Total selling, general and administrative expenses $ 103,734 $ 90,944 $ 93,303