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Stockholders' Deficit (Narrative) (Details) shares in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2018 $ / shares shares | Oct. 31, 2018 $ / shares shares
Class of Stock [Line Items] |  |
Common stock repurchased and retired (in shares) | 0.8 | 2.1
Repurchased shares of its common stock on the open market, average repurchase price per share (in usd per share) | $ / shares | $ 131.42 | $ 129.86
Common Stock Repurchase Program |  |
Class of Stock [Line Items] |  |
Common stock shares remained available for repurchase under repurchase plans (in shares) | 17.6 | 17.6

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