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Equity Compensation - Summary of ESPP Activity (Details) - Employee Stock - 1998 Employee Qualified Stock Purchase Plan - $ / shares shares in Millions | 3 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Issued shares (in shares) | 0.5 | 0.5
Average price of issued shares (in usd per share) | $ 128.02 | $ 122.54
Weighted average grant date fair value of shares granted under the ESPP (in usd per share) | $ 91.17 | $ 45.70

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