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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, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Jan. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 398,800		$ 398,800		$ 70,700
Less accumulated amortization	(66,217)		(66,217)		(36,466)
Acquisition-related intangible assets, net	332,583		332,583		34,234
Amortization of intangible assets	20,000	$ 4,000	30,000	$ 14,000
Developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	186,800		186,800		69,700
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	189,000		189,000		1,000
Trade name
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	12,000		12,000		0
Backlog
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 11,000		$ 11,000		$ 0

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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