For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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Basis of Presentation - Additional Information (Detail 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025
Company And Summary Of Significant Accounting Policies [Line Items]
Increase (decrease) in unbilled accounts receivable			$ (5.0)
Capitalized costs, net, related to software developed for resale	$ 816.4		816.4		$ 780.3
Capitalized cost related to software development for resale	22.6	$ 19.0	46.1	$ 37.8
Amortization expense of capitalized software development costs	4.9	15.1	19.8	29.4
Capitalized Computer Software, Accumulated Amortization	534.0		534.0		515.8
Gross capitalized implementation costs incurred in cloud computing arrangements	105.6		105.6		88.7
Accumulated amortization related to capitalized implementation costs incurred in cloud computing arrangements	23.6		23.6		$ 18.4
Amortization of capitalized implementation costs incurred in cloud computing arrangements	$ 2.6	$ 1.7	$ 5.1	$ 3.2
Maximum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life, years	12 years		12 years
Computer Software, Intangible Asset [Member] \| Maximum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life, years	5 years		5 years
Funded Research and Development from Customer Contracts [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue	10.00%	12.00%	10.00%	12.00%
U.S. Government as an Individual Customer [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue	17.00%	18.00%	16.00%	17.00%