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Changes in Accumulated Other Comprehensive Income ("AOCI") by Component, Net of Tax (Detail)
$ in Thousands
6 Months Ended
Dec. 31, 2017
USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance $ 900,563
Other comprehensive income before reclassifications 15,182
Amounts reclassified from AOCI 118
Net current-period other comprehensive income 15,300
Ending Balance 963,901
Foreign Currency Translation Adjustment  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance (8,460)
Other comprehensive income before reclassifications 15,182
Net current-period other comprehensive income 15,182
Ending Balance 6,722
Defined Benefit Pension Plan  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance (5,318)
Amounts reclassified from AOCI 118
Net current-period other comprehensive income 118
Ending Balance (5,200)
Accumulated Other Comprehensive Income (Loss)  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance (13,778)
Ending Balance $ 1,522