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

Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued, Average Price

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- Definition

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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

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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