Description of Business and Summary of Significant Accounting Policies (Detail) $ in Thousands	12 Months Ended
	Mar. 31, 2022 USD ($) Segment	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Apr. 01, 2021 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Reportable segments | Segment	1
Gross value of capitalized internal use software	$ 16,400	$ 17,600	$ 8,100
Stock-based compensation costs	3,700	4,100	1,500
Amortization expense	10,700	7,000	4,900
Net book value of capitalized software	28,000	23,200
Capitalized implementation costs	1,600	2,100	2,500
Amortization expense	1,300	1,200	200
Accumulated deficit	(783,308)	(587,116)
Convertible senior notes, net	497,663	449,380
Accounting Standards Update 2020-06
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit				$ 54,200
Decrease to additional paid in capital				100,100
Convertible senior notes, net				$ 45,900
Sales and marketing
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Advertising expense	$ 29,000	$ 24,500	$ 21,800
Computers and Software
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful life	3 years
Other Office Equipment and Site-related Computer Hardware
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful life	3 years
Furniture and Fixtures
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful life	5 years
Capitalized Software Development Costs
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful life	3 years