Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Operating Loss Carryforwards [Line Items]
Blended rate (as a percent)			31.50%
Income tax reserves	$ 56,130	$ 11,509	$ 11,800
Unrecognized tax benefits that would impact effective tax rate	55,200	11,100	11,600
Accrued interest and penalties	500	200	100
Income tax reserve, accrued penalties and interest	900	400	200
Reasonably possible change in unrecognized tax benefits from lapse of statute of limitations	11,200
Reconciliation of the beginning and ending amount of potential tax benefits
Beginning of year	11,083	11,608	11,588
Increases in prior year position	34,001	93	41
Increases in current year position	10,970	575	0
Decreases in prior year position	(765)	0	0
Settlements with taxing authorities	0	(731)	0
Lapse of statute of limitations	(68)	(462)	(21)
End of year	55,221	$ 11,083	$ 11,608
Domestic
Operating Loss Carryforwards [Line Items]
Net operating losses	2,000
State
Operating Loss Carryforwards [Line Items]
Net operating losses	1,300
Foreign
Operating Loss Carryforwards [Line Items]
Net operating losses	2,400
Tax Years 2013-2015
Operating Loss Carryforwards [Line Items]
Income tax assessments	11,700
Tax Years 2016-2019
Operating Loss Carryforwards [Line Items]
Income tax assessments	$ 32,500