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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 | 9 Months Ended
--- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Issued shares (in shares) | 0.4 | 0.4 | 0.9 | 0.9
Average price of issued shares (in usd per share) | $ 133.00 | $ 122.93 | $ 130.13 | $ 122.73
Weighted average grant date fair value of shares granted under the ESPP (in usd per share) | $ 83.75 | $ 78.26 | $ 84.21 | $ 55.98

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