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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - shares | 9 Months Ended
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Sep. 26, 2015 | Sep. 27, 2014
Statement of Stockholders' Equity [Abstract] |  |
Purchase of treasury shares, shares acquired (in shares) | 1,236,771 | 2,126,392
Stock plan exercises; shares acquired (in shares) | 98,367 | 83,431
Stock options exercised; shares issued (in shares) | 138,657 | 171,508
Stock awards; shares issued (in shares) | 5,943 | 8,247

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