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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Detail) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Deferred tax assets:
Unearned revenue	$ 21,557	$ 27,934
Other reserves and accruals	23,384	14,945
Federal net operating loss carryforwards	602,310	422,235
State and foreign net operating loss carryforwards	202,607	81,757
Property and equipment	7,168	0
Share-based compensation	51,233	39,294
Research and development credits	164,555	110,694
Intangibles	519,402	0
Other	2,208	5,622
Deferred tax asset	1,594,424	702,481
Valuation allowance	(1,515,945)	(625,030)
Deferred tax assets, net of valuation allowance	78,479	77,451
Deferred tax liabilities:
Intangibles	0	(1,453)
Intercompany transactions	(29,885)	(40,338)
Other prepaid assets	(448)	(742)
Deferred commissions	(45,277)	(29,231)
Property and equipment	0	(3,803)
Deferred tax liabilities	(75,610)	(75,567)
Net deferred tax assets	$ 2,869	$ 1,884

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