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Income Taxes - Summary of Income Tax Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns      
Unrecognized tax benefits at the beginning of the year $ 68,439 $ 50,365 $ 69,018
Increases for tax positions taken in prior years 4,642 6,788 4,245
Decreases for tax positions taken in prior years (6,045) (246) (1,209)
Increases for tax positions taken in current year 16,812 14,696 13,636
Decreases for settlements with taxing authorities (9,666) 0 (8,762)
Decreases for lapsing of statutes of limitations (10,188) (3,164) (26,563)
Unrecognized tax benefits at the end of the year $ 63,994 $ 68,439 $ 50,365