Composition of Certain Financial Statement Captions - Summary of Equipment and Improvements (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Mar. 31, 2023
Property Plant And Equipment [Line Items]
Equipment and improvements, gross	$ 62,521	$ 67,021
Accumulated depreciation and amortization	(57,582)	(60,600)
Equipment and improvements, net	4,939	6,421
Computer Equipment
Property Plant And Equipment [Line Items]
Equipment and improvements, gross	34,503	35,019
Internal-Use Software
Property Plant And Equipment [Line Items]
Equipment and improvements, gross	20,689	20,064
Leasehold Improvements
Property Plant And Equipment [Line Items]
Equipment and improvements, gross	4,542	7,067
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Equipment and improvements, gross	$ 2,787	$ 4,871