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Equity - Treasury Shares (Details) - USD ($) shares in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 26, 2015 | Sep. 27, 2014 | Dec. 27, 2014 | Dec. 28, 2013 | Dec. 25, 2010 | Jul. 31, 2010
Treasury Shares |  |  |  |  |  |
Purchase of treasury stock | $ 117,431,000 | $ 121,985,000 |  |  |  |
2010 Share Repurchase Program |  |  |  |  |  |
Treasury Shares |  |  |  |  |  |
Authorized stock repurchase amount | $ 1,150,000,000 |  |  |  |  | $ 500,000,000
Authorized increase, stock repurchase |  |  | $ 150,000,000 | $ 250,000,000 | $ 250,000,000 |
Stock repurchased during period (in shares) | 1.5 | 2.1 |  |  |  |
Purchase of treasury stock | $ 108,800,000 | $ 110,600,000 |  |  |  |
Remaining authorized repurchase amount | $ 69,700,000 |  |  |  |  |
2007 Incentive Plan |  |  |  |  |  |
Treasury Shares |  |  |  |  |  |
Number of shares of common stock repurchased (in shares) | 0.1 | 0.1 |  |  |  |
Open market repurchases |  |  |  |  |  |
Treasury Shares |  |  |  |  |  |
Purchase of treasury stock | $ 8,700,000 | $ 6,700,000 |  |  |  |

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