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Acquisition-related Intangible Assets, Net - Schedule of Acquired Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Jan. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 398,800		$ 398,800
Less accumulated amortization	(104,903)		(85,560)
Total	293,897		313,240
Developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	186,800		186,800
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	189,000		189,000
Trade name
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	12,000		12,000
Backlog
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	11,000		$ 11,000
Acquired Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Total	293,897
Amortization of intangible assets	$ 19,000	$ 5,000