Stock-based Compensation Expense (Summary of ESPP Activity) (Details) - Employee Stock - Employee Qualified Stock Purchase Plan 1998 ESP Plan - $ / shares shares in Millions	6 Months Ended
Jul. 31, 2018	Jul. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued shares (shares)	0.5	1.1
Average price of issued shares (in dollars per share)	$ 88.45	$ 38.34
Weighed average grant date fair value of awards granted under the ESPP (in dollars per share)	$ 37.64	$ 25.13

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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