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Equity Compensation - 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, 2022 | Jan. 31, 2021 | Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issued shares (in shares) | 0.9 | 0.9 | 0.9
Average price of issued shares (in dollars per share) | $ 130.13 | $ 122.73 | $ 102.20
Weighted average grant date fair value of awards granted under the ESPP (in dollars per share) | $ 84.21 | $ 55.98 | $ 47.78

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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