The Company and a Summary of Its Significant Accounting Policies - Additional Information (Detail 7) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Company And Summary Of Significant Accounting Policies [Line Items]
Capitalized contract cost amortization and reduction of carrying value associated with contract termination	$ 33.1	$ 40.4	$ 48.2
Advertising costs	19.2	26.4	$ 22.8
Prepaid Expenses and Other Current Assets [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Deferred customer contract costs	15.2	20.2
Other Noncurrent Assets [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Deferred customer contract costs	54.2	58.0
Deferred Customer Contract Acquisition Cost [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Deferred customer contract costs	13.0	23.1
Deferred Customer Contract Fulfillment Cost [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Deferred customer contract costs	$ 56.4	$ 55.1