General - Narrative (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of reportable segments | segment	6
Money market funds	$ 773,092	$ 436,241
Capitalized cloud computing arrangements, net	2,983	626
Capitalized cloud computing arrangements, net, additions	3,097
Research and development costs	28,626	27,555	$ 23,187
Advertising, marketing, and promotion expense	188,345	144,948	118,291
Prepaid advertising, marketing, and promotion expense	$ 1,762	2,664
Employer matching contribution percentage	50.00%
Employer matching contribution, percent of employees' gross pay	6.00%
Defined contribution plan cost	$ 3,339	3,251	3,060
Prepaid Expenses
Restructuring Cost and Reserve [Line Items]
Capitalized cloud computing arrangements, net	1,308	278
Other Assets
Restructuring Cost and Reserve [Line Items]
Capitalized cloud computing arrangements, net	1,675	348
Retail Stores Segment
Restructuring Cost and Reserve [Line Items]
Asset impairment charges	$ 14,084	$ 1,365	$ 180
Minimum
Restructuring Cost and Reserve [Line Items]
Property, plant and equipment useful life (at least)	1 year
Customer payment terms	30 days
Minimum | Cloud Computing Arrangement
Restructuring Cost and Reserve [Line Items]
Hosting arrangement useful life	1 year
Maximum
Restructuring Cost and Reserve [Line Items]
Derivative term of contract	15 months
Customer payment terms	60 days
Maximum | Cloud Computing Arrangement
Restructuring Cost and Reserve [Line Items]
Hosting arrangement useful life	3 years