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Employee Stock Plans (Narrative) (Details) shares in Millions | Apr. 09, 2015 $ / shares | Dec. 27, 2015 $ / shares shares | Sep. 27, 2015 $ / shares
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Common stock, par value | $ / shares |  | $ 0.001 | $ 0.001
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Stock split conversion ratio | 2 |  |
Common stock, par value | $ / shares | $ 0.001 |  |
Stock Options and Restricted Stock Units [Member] |  |  |
Common stock available for issuance pursuant to future equity-based compensation awards and ESPP | shares |  | 84.4 |
Employee Stock Purchase Plan [Member] |  |  |
Common stock available for issuance pursuant to future equity-based compensation awards and ESPP | shares |  | 14.2 |

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