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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