Changes in Accumulated Other Comprehensive Income ("AOCI") by Component, Net of Tax (Detail) $ in Thousands	9 Months Ended
	Mar. 31, 2017 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 782,338
Other comprehensive loss before reclassifications	(12,145)
Amounts reclassified from AOCI	163
Net current-period other comprehensive income (loss)	(11,982)
Ending Balance	852,896
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(6,185)
Other comprehensive loss before reclassifications	(12,145)
Net current-period other comprehensive income (loss)	(12,145)
Ending Balance	(18,330)
Defined Benefit Pension Plan
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(7,832)
Amounts reclassified from AOCI	163
Net current-period other comprehensive income (loss)	163
Ending Balance	(7,669)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(14,017)
Ending Balance	$ (25,999)