Basis of Presentation - Additional Information (Detail 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Mar. 31, 2025
Company And Summary Of Significant Accounting Policies [Line Items]
Increase (decrease) in unbilled accounts receivable			$ 46.9
Capitalized costs, net, related to software developed for resale	$ 845.2		845.2		$ 780.3
Capitalized cost related to software development for resale	29.8	$ 18.3	75.9	$ 56.1
Amortization expense of capitalized software development costs	10.3	13.5	30.1	42.9
Capitalized Computer Software, Accumulated Amortization	543.7		543.7		515.8
Gross capitalized implementation costs incurred in cloud computing arrangements	109.2		109.2		88.7
Accumulated amortization related to capitalized implementation costs incurred in cloud computing arrangements	26.3		26.3		$ 18.4
Amortization of capitalized implementation costs incurred in cloud computing arrangements	$ 2.7	$ 2.2	$ 7.8	$ 5.4
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	11.00%	11.00%	11.00%	12.00%
U.S. Government as an Individual Customer [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue	16.00%	20.00%	16.00%	18.00%