Employee and Director Stock Plans - ESPP Activity (Details) - ESPP - Employee Qualified Stock Purchase Plan 1998 ESP Plan - $ / shares shares in Millions	12 Months Ended
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

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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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