Stock-based Compensation Expense (Summary of ESPP Activity) (Details) - Employee Stock - 1998 Employee Qualified Stock Purchase Plan - $ / shares shares in Millions	3 Months Ended
Apr. 30, 2019	Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued shares (shares)	0.5	0.5
Average price of issued shares (in dollars per share)	$ 99.46	$ 88.45
Weighed average grant date fair value of awards granted under the ESPP (in dollars per share)	$ 52.41	$ 37.64

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.

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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.

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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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