Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Jan. 01, 2017	Dec. 31, 2017	Jan. 01, 2017
Income Tax Contingency [Line Items]
Benefit from (provision for) income taxes		$ 101,033	$ (4,072)	$ 100,020	$ (7,451)
Tax Cuts and jobs act of 2017, incomplete accounting, change in tax rate, provisional income tax expense (benefit)				10,200
Tax cuts and jobs act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense (benefit)				91,700
Tax cuts and jobs act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional liability, current		2,800		2,800
Tax cuts and jobs act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional liability, noncurrent		29,800		29,800
Tax cuts and jobs act Of 2017, incomplete accounting, change in tax rate, deferred tax asset, provisional income tax expense (benefit)				59,100
Tax Cuts and jobs act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional liability		$ 6,000		6,000
Deferred tax charge				$ 9,900
Scenario, Forecast
Income Tax Contingency [Line Items]
Federal statutory rate	31.50%