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Quarterly Data (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 26, 2012
Sep. 26, 2012
Jun. 27, 2012
Mar. 28, 2012
Dec. 28, 2011
Sep. 28, 2011
Jun. 29, 2011
Mar. 30, 2011
Dec. 26, 2012
Dec. 28, 2011
Dec. 29, 2010
Quarterly Financial Information Disclosure [Abstract]                      
Company restaurant sales $ 81,733 $ 86,575 $ 91,239 $ 94,163 $ 98,360 $ 104,659 $ 104,021 $ 104,555 $ 353,710 $ 411,595 $ 423,936
Franchise and licensing revenue 34,216 34,370 33,492 32,575 31,834 32,023 31,832 31,250 134,653 126,939 124,530
Total operating revenue 115,949 120,945 124,731 126,738 130,194 136,682 135,853 135,805 488,363 538,534 548,466
Total operating costs and expenses 104,162 109,255 105,732 112,825 118,388 122,715 122,146 124,311 431,974 487,560 493,298
Operating income 11,787 11,690 18,999 13,913 11,806 13,967 13,707 11,494 56,389 50,974 55,168
Net income $ 6,480 $ 5,363 $ 4,601 $ 5,865 $ 92,048 $ 7,985 $ 8,130 $ 4,124 $ 22,309 $ 112,287 $ 22,713
Basic net income per share (US$ per share) $ 0.07 [1] $ 0.06 [1] $ 0.05 [1] $ 0.06 [1] $ 0.96 [2] $ 0.08 [2] $ 0.08 [2] $ 0.04 [2] $ 0.23 $ 1.15 $ 0.23
Diluted net income per share (US$ per share) $ 0.07 [1] $ 0.06 [1] $ 0.05 [1] $ 0.06 [1] $ 0.94 [2] $ 0.08 [2] $ 0.08 [2] $ 0.04 [2] $ 0.23 $ 1.13 $ 0.22
[1] Per share amounts do not necessarily sum to the total year amounts due to changes in shares outstanding and rounding
[2] Per share amounts do not necessarily sum to the total year amounts due to changes in shares outstanding and rounding.