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Net Loss Per Share (Summary of Diluted Net Loss Per Common Share) (Detail) - shares
shares in Thousands
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total anti-dilutive securities (in shares) 41,486 50,428 36,369
Outstanding common stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total anti-dilutive securities (in shares) 5,781 6,595 9,097
Shares subject to repurchase      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total anti-dilutive securities (in shares) 0 0 110
Unvested restricted stock awards, units, and PRSUs      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total anti-dilutive securities (in shares) 13,551 13,209 12,155
Shares related to the convertible senior notes      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total anti-dilutive securities (in shares) 10,876 15,079 7,261
Shares subject to warrants related to the issuance of convertible senior notes      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total anti-dilutive securities (in shares) 10,876 15,079 7,261
Shares issuable pursuant to the ESPP      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total anti-dilutive securities (in shares) 402 466 485