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Acquisition-Related Intangible Assets, Net - Schedule of Acquired Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022	Jan. 31, 2023
Acquisition-related intangible assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 681,300		$ 681,300		$ 681,300
Less accumulated amortization	(418,244)		(418,244)		(375,835)
Total	263,056		263,056		305,465
Amortization of intangible assets	21,000	$ 21,000	42,000	$ 43,000
Developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	342,700		342,700		342,700
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	311,100		311,100		311,100
Backlog
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	15,000		15,000		15,000
Trade name
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 12,500		$ 12,500		$ 12,500