Quarterly report pursuant to Section 13 or 15(d)

Product Warranty Liability - Reconciliation of the Changes in Product Warranty Liability (Detail)

v3.8.0.1
Product Warranty Liability - Reconciliation of the Changes in Product Warranty Liability (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Guarantees [Abstract]        
Balance at beginning of period $ 291 $ 694 $ 538 $ 686
Expense (income) for product warranties 78 (54) (82) 111
Product warranty claims paid (68) (58) (155) (215)
Balance at end of period $ 301 $ 582 $ 301 $ 582