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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, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Jan. 31, 2021
Acquisition-related intangible assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 634,900		$ 634,900		$ 464,400
Less accumulated amortization	(253,508)		(253,508)		(215,774)
Total	381,392		381,392		248,626
Amortization of intangible assets	20,000	$ 16,000	38,000	$ 32,000
Developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	312,400		312,400		218,400
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	295,000		295,000		223,000
Trade name
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	12,500		12,500		12,000
Backlog
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 15,000		$ 15,000		$ 11,000