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Stockholders' Equity (Share Repurchase) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Sep. 28, 2018 | Sep. 29, 2017 | Sep. 30, 2016
Share Repurchase [Line Items] |  |  |  |
Share repurchase authorized date | Jan. 31, 2018 |  |  |
Share repurchase program |  | $ 759.5 | $ 432.3 | $ 525.6
Share repurchase program (in shares) |  | 7.7 | 4.7 |
Treasury stock, average price per share (in dollars per share) |  | $ 98.84 | $ 92.97 |
Remaining shares available under share repurchase program |  | $ 413.0 |  |
Authorized repurchased amount |  | $ 1,000.0 |  |
Stock Repurchase Program Expiration Date | Jan. 31, 2020 |  |  |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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