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Changes in Accumulated Other Comprehensive Income ("AOCI") by Component, Net of Tax (Detail)
$ in Thousands
3 Months Ended
Sep. 30, 2017
USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance $ 900,563
Other comprehensive income before reclassifications 11,097
Amounts reclassified from AOCI 82
Net current-period other comprehensive income 11,179
Ending Balance 943,762
Foreign Currency Translation Adjustment  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance (8,460)
Other comprehensive income before reclassifications 11,097
Net current-period other comprehensive income 11,097
Ending Balance 2,637
Defined Benefit Pension Plan  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance (5,318)
Amounts reclassified from AOCI 82
Net current-period other comprehensive income 82
Ending Balance (5,236)
Accumulated Other Comprehensive Income (Loss)  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance (13,778)
Ending Balance $ (2,599)