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Accounts Payable and Accrued Expenses - Schedule of Product Warranty Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Movement in Extended Product Warranty Accrual [Roll Forward]        
Balance at beginning of period $ 2,774 $ 3,344 $ 3,601 $ 3,934
Change in accruals for warranties during the period 316 429 417 423
Settlements during the period (396) (500) (1,324) (1,084)
Balance at end of period $ 2,694 $ 3,273 $ 2,694 $ 3,273