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Basis of Presentation - Additional Information (Detail 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Mar. 31, 2026
Company And Summary Of Significant Accounting Policies [Line Items]
Capitalized costs, net, related to software developed for resale	$ 903.9		$ 903.9		$ 871.1
Capitalized cost related to software development for resale	21.4	$ 22.6	41.6	$ 46.1
Amortization expense of capitalized software development costs	14.4	4.9	26.2	19.8
Capitalized Computer Software, Accumulated Amortization	576.1		576.1		554.2
Gross capitalized implementation costs incurred in cloud computing arrangements	116.7		116.7		112.2
Accumulated amortization related to capitalized implementation costs incurred in cloud computing arrangements	34.8		34.8		$ 29.0
Amortization of capitalized implementation costs incurred in cloud computing arrangements	$ 3.3	$ 2.6	$ 5.8	$ 5.1
Maximum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life, years	12 years		12 years
Software Development [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	12.00%	10.00%	11.00%	10.00%
U.S. Government as an Individual Customer [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue	20.00%	17.00%	19.00%	16.00%