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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Operating Loss Carryforwards [Line Items]            
Provision for (benefit from) income taxes   $ (9,309) $ (20,040) $ (10,295) $ (18,691)  
Effective income tax rates   7.60% 19.90% 4.60% 9.70%  
Provisional income tax charge from estimated remeasurement of federal deferred tax assets and liabilities $ 19,900          
Income tax benefit from assessment of valuation allowance $ 4,100          
Tax benefit from reversal of uncertain tax position   $ 900 $ 6,000 $ 2,300 $ 7,900  
Unrecognized tax benefits   74,600   74,600   $ 69,100
Accrued interest and penalties related to uncertain tax positions   2,400   2,400   2,300
Expected decrease in uncertain tax positions   7,000   7,000    
Non-current income tax payable            
Operating Loss Carryforwards [Line Items]            
Unrecognized tax benefits   $ 36,200   $ 36,200   $ 35,000