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Stock-based Compensation Expense (Summary of ESPP Activity) (Details) - Employee Stock - 1998 Employee Qualified Stock Purchase Plan - $ / shares shares in Millions | 6 Months Ended
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Jul. 31, 2019 | Jul. 31, 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

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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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