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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) (USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 25, 2010 | Dec. 26, 2009
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY |  |  |
Cash dividends, per share | $ 0.705 | $ 0.645 | $ 0.580
Purchase of treasury shares, shares | 53,847 | 12,351 | 8,943
Stock plan exercises; shares acquired | 184,639 | 109,711 | 112,901
Stock options exercised; shares issued | 306,218 | 43,104 | 186,120
Stock awards; shares issued | 23,968 | 9,088 |

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