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Income Taxes - Interest and Penalties Related to Liabilities for Income Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Income Tax Disclosure [Abstract]      
Interest expense $ 6,233 $ 13,028 $ 6,534
Penalties expense (recoveries) (191) 438 (2,761)
Total $ 6,042 $ 13,466 $ 3,773