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Changes in Accumulated Other Comprehensive Income ("AOCI") by Component, Net of Tax (Detail)
$ in Thousands
9 Months Ended
Mar. 31, 2018
USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance $ 900,563
Other comprehensive income before reclassifications 30,885
Net current-period other comprehensive income 30,885
Ending Balance 1,015,172
Foreign Currency Translation Adjustment  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance (8,460)
Other comprehensive income before reclassifications 30,885
Net current-period other comprehensive income 30,885
Ending Balance 22,425
Defined Benefit Pension Plan  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance (5,318)
Ending Balance (5,318)
Accumulated Other Comprehensive Income (Loss)  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance (13,778)
Ending Balance $ 17,107