Net Interest Expense, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Interest Income (Expense), Net [Abstract]
Interest Income	$ (14)	$ (40)	$ (6)
Interest Expense	26,433	21,595	15,891
Other Expenses	1,219	1,076	698
Interest Expense, net	$ 27,638	$ 22,631	$ 16,583