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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2017
Mar. 31, 2017
Income Tax Disclosure [Line Items]            
Provision for (benefit from) income taxes $ 4,087 $ 5,593 $ (1,349) $ 8,650    
Effective income tax rates 6.80% 10.60% (1.50%) 11.10%    
Excess tax benefits $ 1,100   $ 11,000      
Lapse of statute of limitations 700 $ 700 1,900 $ 1,800    
Unrecognized tax benefits 68,700   68,700     $ 63,700
Accrued interest and penalties related to uncertain tax positions 3,200   3,200     3,000
Expected decrease in uncertain tax positions 7,800   7,800      
Non-current income tax payable            
Income Tax Disclosure [Line Items]            
Unrecognized tax benefits 33,200   33,200     51,800
Current income tax payable            
Income Tax Disclosure [Line Items]            
Unrecognized tax benefits $ 1,900   $ 1,900     $ 1,500
Scenario, Forecast | Settlement with Taxing Authority            
Income Tax Disclosure [Line Items]            
Tax settlement, foreign jurisdiction         $ 1,900