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Significant Accounting Policies (Stock-based Compensation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 29, 2017 | Sep. 30, 2016 | Oct. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 38,764 | $ 32,370 | $ 41,412
Restricted Stock and Restricted Stock Units (excluding Market and Performance Awards) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 26,393 | 21,156 | 20,779
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 4,338 | 7,165 | 10,683
Market and Performance Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 8,033 | $ 4,049 | $ 9,950

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