Stock-based Compensation Expense (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, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued shares (shares)	0.4	0.4	0.9	0.9
Average price of issued shares (in dollars per share)	$ 122.93	$ 105.42	$ 122.73	$ 102.20
Weighed average grant date fair value of awards granted under the ESPP (in dollars per share)	$ 78.26	$ 44.77	$ 55.98	$ 47.78

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

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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.

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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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