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Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Payables and Accruals [Abstract]    
Employee compensation $ 28,508 $ 30,330
Sales and income taxes 6,990 4,562
Marketing 3,001 2,305
Research & development 2,606 3,162
Professional, legal, and accounting fees 1,510 1,870
Warranty 1,160 1,081
Accrued capital expenditures   250
Other 2,324 2,587
Accrued expenses $ 46,099 $ 46,147