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Income Taxes - Changes in the Balance of Gross Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Unrecognized tax benefits as of Beginning of the Period $ 174,530 $ 174,485
Increases on account of current year positions 6,483 5,675
Increases on account of prior year positions 17,794 18,938
Decreases due to settlements with tax authorities 0 (16,332)
Decreases due to lapses of statutes of limitations (20,995) (8,236)
Unrecognized tax benefits as of End of the Period $ 177,812 $ 174,530