The Company and a Summary of Its Significant Accounting Policies - Additional Information (Detail 7) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Company And Summary Of Significant Accounting Policies [Line Items]
Capitalized contract cost amortization and reduction of carrying value associated with contract termination	$ 40.4	$ 48.2	$ 56.5
Advertising costs	26.4	22.8	$ 23.1
Prepaid Expenses and Other Current Assets [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Deferred customer contract costs	20.2	19.8
Other Noncurrent Assets [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Deferred customer contract costs	58.0	61.7
Deferred Customer Contract Acquisition Cost [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Deferred customer contract costs	23.1	31.5
Deferred Customer Contract Fulfillment Cost [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Deferred customer contract costs	$ 55.1	$ 50.0