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Income Taxes - Details of Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]    
Income before income taxes $ 427,568 $ 336,152
Provision for income taxes $ 31,624 $ 55,216
Effective tax rate 7.40% 16.40%