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Change in Carrying Value of Company's Warranty Reserve (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Other Liabilities Disclosure [Abstract]    
Balance-Beginning of Year $ 4,546 $ 3,908
Settlements during the period (3,688) (4,212)
Additional warranty liability recorded 3,821 4,850
Balance-End of Year $ 4,679 $ 4,546