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Employee Stock and Benefit Plans (Narrative) (Details) $ / shares in Units, shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 09, 2015 $ / shares | Sep. 27, 2015 USD ($) $ / shares shares | Sep. 28, 2014 USD ($) $ / shares | Sep. 29, 2013 USD ($) $ / shares
Class of Stock [Line Items] |  |  |  |
Stock split conversion ratio | 2 |  |  |
Common stock, par value | $ / shares |  | $ 0.001 | $ 0.001 |
Maximum permitted contribution to Employee Stock Purchase Plan, percent |  | 10.00% |  |
Discounted stock purchase price, percent of market value |  | 95.00% |  |
Number of shares issued under plan | shares |  | 0.5 |  |
Matching contributions |  | $ 70.9 | $ 73.0 | $ 54.7
Stock Options and Restricted Stock Units [Member] |  |  |  |
Common stock available for issuance | shares |  | 96.3 |  |
Employee Stock [Member] |  |  |  |
Common stock available for issuance | shares |  | 14.3 |  |
Stock Options [Member] |  |  |  |
Award expiration period (years) |  | 10 years |  |
Total unrecognized stock-based compensation expense, net of estimated forfeitures |  | $ 32.0 |  |
Weighted average recognition period for total unrecognized stock-based compensation expense (in years) |  | 2 years 7 months 3 days |  |
Total intrinsic value of stock options exercised |  | $ 358.0 | 258.0 | 539.0
Total fair value of options vested |  | 36.0 | $ 44.0 | $ 56.0
Restricted Stock Units (RSUs) [Member] |  |  |  |
Total unrecognized stock-based compensation expense, net of estimated forfeitures |  | $ 126.0 |  |
Weighted average recognition period for total unrecognized stock-based compensation expense (in years) |  | 2 years 3 months 3 days |  |
Granted, weighted average grant date fair value per share | $ / shares |  | $ 38.56 | $ 40.07 | $ 25.12
Total fair value of RSUs vested |  | $ 137.0 | $ 103.0 | $ 104.0
Director [Member] | Stock Options [Member] | Minimum [Member] |  |  |  |
Award vesting period for non-employee directors (years) |  | 1 year |  |
Director [Member] | Stock Options [Member] | Maximum [Member] |  |  |  |
Award vesting period for non-employee directors (years) |  | 3 years |  |
Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock split conversion ratio | 2 |  |  |
Common stock, par value | $ / shares | $ 0.001 |  |  |

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