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Stock-based Compensation Expense (Summary of ESPP Activity) (Details) - Employee Stock - Employee Qualified Stock Purchase Plan 1998 ESP Plan - $ / shares shares in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Issued shares (shares) | 0.5 | 0.9 | 1.0 | 2.0
Average price of issued shares (in dollars per share) | $ 92.50 | $ 39.92 | $ 90.25 | $ 39.03
Weighed average grant date fair value of awards granted under the ESPP (in dollars per share) | $ 47.21 | $ 33.04 | $ 42.75 | $ 32.41

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