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Common Stock and Stockholders' Equity (Tables) | 6 Months Ended
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Jul. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary of Information Related to Restricted Stock Units Activity | A summary of information related to RSU activity during the six months ended July 31, 2019, is as follows:
| Number of Shares |  | Weighted-Average Grant Date Fair Value
Balance as of January 31, 2019 | 13,013,289 |  |  | $ | 108.12 |
RSUs granted | 4,623,949 |  |  | 191.13 |
RSUs vested | (3,426,770 | ) |  | 103.56 |
RSUs forfeited | (511,962 | ) |  | 119.05 |
Balance as of July 31, 2019 | 13,698,506 |  |  | 136.87 |
Summary of Information Related to Stock Option Activity | A summary of information related to stock option activity during the six months ended July 31, 2019, is as follows (in millions, except share and per share data):
| Outstanding Stock Options |  | Weighted-Average Exercise Price |  | Aggregate Intrinsic Value
Balance as of January 31, 2019 | 5,780,742 |  |  | $ | 7.96 |  |  | $ | 1,003 |
Stock options granted | — |  |  | — |  |  |
Stock options exercised | (1,250,557 | ) |  | 5.62 |  |  |
Stock options canceled | (18,568 | ) |  | 22.23 |  |  |
Balance as of July 31, 2019 | 4,511,617 |  |  | 8.55 |  |  | 864 |
Vested and expected to vest as of July 31, 2019 | 4,467,012 |  |  | 8.31 |  |  | 856 |
Exercisable as of July 31, 2019 | 3,947,066 |  |  | 5.67 |  |  | 767 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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