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Acquisition-Related Intangible Assets, Net - Schedule of Acquired Assets (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Jan. 31, 2021
Acquisition-related intangible assets          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, gross $ 644,900   $ 644,900   $ 464,400
Less accumulated amortization (273,242)   (273,242)   (215,774)
Total 371,658   371,658   248,626
Amortization of intangible assets 19,000 $ 14,000 57,000 $ 46,000  
Developed technology          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, gross 319,300   319,300   218,400
Customer relationships          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, gross 298,100   298,100   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