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Employee and Director Stock Plans - ESPP Activity (Details) - ESPP - Employee Qualified Stock Purchase Plan 1998 ESP Plan - $ / shares shares in Millions | 12 Months Ended
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Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issued shares (in shares) | 0.9 | 1.0 | 2.0
Average price of issued shares (in dollars per share) | $ 102.20 | $ 90.25 | $ 39.03
Weighted average grant date fair value of awards granted under the ESPP (in dollars per share) | $ 47.78 | $ 42.75 | $ 32.41

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