Changes in Accumulated Other Comprehensive Income ("AOCI") by Component, Net of Tax (Detail) $ in Thousands	3 Months Ended
	Sep. 30, 2016 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 782,338
Other comprehensive loss before reclassifications	(582)
Amounts reclassified from AOCI	(112)
Net current-period other comprehensive loss	(694)
Ending Balance	800,557
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(6,185)
Other comprehensive loss before reclassifications	(582)
Net current-period other comprehensive loss	(582)
Ending Balance	(6,767)
Defined Benefit Pension Plan
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(7,832)
Amounts reclassified from AOCI	(112)
Net current-period other comprehensive loss	(112)
Ending Balance	(7,944)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(14,017)
Ending Balance	$ (14,711)