Changes in Accumulated Other Comprehensive Income ("AOCI") by Component, Net of Tax (Detail) $ in Thousands	6 Months Ended
	Dec. 31, 2016 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 782,338
Other comprehensive loss before reclassifications	(15,147)
Amounts reclassified from AOCI	312
Net current-period other comprehensive income (loss)	(14,835)
Ending Balance	819,046
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(6,185)
Other comprehensive loss before reclassifications	(15,147)
Net current-period other comprehensive income (loss)	(15,147)
Ending Balance	(21,332)
Defined Benefit Pension Plan
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(7,832)
Amounts reclassified from AOCI	312
Net current-period other comprehensive income (loss)	312
Ending Balance	(7,520)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(14,017)
Ending Balance	$ (28,852)