Employee Benefit Plans (Fair Values of Pension Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified																	12 Months Ended																																																									12 Months Ended
	Dec. 26, 2012 Total [Member]	Dec. 28, 2011 Total [Member]	Dec. 26, 2012 Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]	Dec. 28, 2011 Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]	Dec. 26, 2012 Significant Other Observable Inputs (Level 2) [Member]	Dec. 28, 2011 Significant Other Observable Inputs (Level 2) [Member]	Dec. 26, 2012 Significant Unobservable Inputs (Level 3) [Member]	Dec. 28, 2011 Significant Unobservable Inputs (Level 3) [Member]	Dec. 26, 2012 Cash Equivalents [Member] Total [Member]	Dec. 28, 2011 Cash Equivalents [Member] Total [Member]	Dec. 26, 2012 Cash Equivalents [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]	Dec. 28, 2011 Cash Equivalents [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]	Dec. 26, 2012 Cash Equivalents [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 28, 2011 Cash Equivalents [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 26, 2012 Cash Equivalents [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 28, 2011 Cash Equivalents [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 26, 2012 Equity Securities [Member]	Dec. 26, 2012 U.S. Large-Cap [Member] Total [Member]		Dec. 28, 2011 U.S. Large-Cap [Member] Total [Member]		Dec. 26, 2012 U.S. Large-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]		Dec. 28, 2011 U.S. Large-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]		Dec. 26, 2012 U.S. Large-Cap [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 28, 2011 U.S. Large-Cap [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 26, 2012 U.S. Large-Cap [Member] Significant Unobservable Inputs (Level 3) [Member]		Dec. 28, 2011 U.S. Large-Cap [Member] Significant Unobservable Inputs (Level 3) [Member]		Dec. 26, 2012 U.S. Mid-Cap [Member] Total [Member]		Dec. 28, 2011 U.S. Mid-Cap [Member] Total [Member]		Dec. 26, 2012 U.S. Mid-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]		Dec. 28, 2011 U.S. Mid-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]		Dec. 26, 2012 U.S. Mid-Cap [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 28, 2011 U.S. Mid-Cap [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 26, 2012 U.S. Mid-Cap [Member] Significant Unobservable Inputs (Level 3) [Member]		Dec. 28, 2011 U.S. Mid-Cap [Member] Significant Unobservable Inputs (Level 3) [Member]		Dec. 26, 2012 U.S. Small-Cap [Member] Total [Member]		Dec. 28, 2011 U.S. Small-Cap [Member] Total [Member]		Dec. 26, 2012 U.S. Small-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]		Dec. 28, 2011 U.S. Small-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]		Dec. 26, 2012 U.S. Small-Cap [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 28, 2011 U.S. Small-Cap [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 26, 2012 U.S. Small-Cap [Member] Significant Unobservable Inputs (Level 3) [Member]		Dec. 28, 2011 U.S. Small-Cap [Member] Significant Unobservable Inputs (Level 3) [Member]		Dec. 26, 2012 International Large-Cap [Member] Total [Member]	Dec. 28, 2011 International Large-Cap [Member] Total [Member]	Dec. 26, 2012 International Large-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]	Dec. 28, 2011 International Large-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]	Dec. 26, 2012 International Large-Cap [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 28, 2011 International Large-Cap [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 26, 2012 International Large-Cap [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 28, 2011 International Large-Cap [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 26, 2012 Fixed Income Securities [Member]	Dec. 26, 2012 U.S. Treasuries [Member] Total [Member]	Dec. 28, 2011 U.S. Treasuries [Member] Total [Member]	Dec. 26, 2012 U.S. Treasuries [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]	Dec. 28, 2011 U.S. Treasuries [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]	Dec. 26, 2012 U.S. Treasuries [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 28, 2011 U.S. Treasuries [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 26, 2012 U.S. Treasuries [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 28, 2011 U.S. Treasuries [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 26, 2012 Corporate Bonds [Member] Total [Member]		Dec. 28, 2011 Corporate Bonds [Member] Total [Member]		Dec. 26, 2012 Corporate Bonds [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]		Dec. 28, 2011 Corporate Bonds [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]		Dec. 26, 2012 Corporate Bonds [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 28, 2011 Corporate Bonds [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 26, 2012 Corporate Bonds [Member] Significant Unobservable Inputs (Level 3) [Member]		Dec. 28, 2011 Corporate Bonds [Member] Significant Unobservable Inputs (Level 3) [Member]		Dec. 26, 2012 Commingled Funds [Member] Total [Member]		Dec. 28, 2011 Commingled Funds [Member] Total [Member]		Dec. 26, 2012 Commingled Funds [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]		Dec. 28, 2011 Commingled Funds [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]		Dec. 26, 2012 Commingled Funds [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 28, 2011 Commingled Funds [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 26, 2012 Commingled Funds [Member] Significant Unobservable Inputs (Level 3) [Member]		Dec. 28, 2011 Commingled Funds [Member] Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation																	60.00%																																																									40.00%
Fair value of plan assets	$ 58,006	$ 53,270	$ 54,354	$ 49,900	$ 3,652	$ 3,370	$ 0	$ 0	$ 873	$ 611	$ 873	$ 611	$ 0	$ 0	$ 0	$ 0		$ 15,569	[1]	$ 14,208	[1]	$ 15,569	[1]	$ 14,208	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 4,702	[2]	$ 4,371	[2]	$ 4,702	[2]	$ 4,371	[2]	$ 0	[2]	$ 0	[2]	$ 0	[2]	$ 0	[2]	$ 1,157	[3]	$ 1,046	[3]	$ 1,157	[3]	$ 1,046	[3]	$ 0	[3]	$ 0	[3]	$ 0	[3]	$ 0	[3]	$ 9,292	$ 8,440	$ 9,292	$ 8,440	$ 0	$ 0	$ 0	$ 0		$ 2,582	$ 2,375	$ 2,582	$ 2,375	$ 0	$ 0	$ 0	$ 0	$ 20,179	[4]	$ 18,849	[4]	$ 20,179	[4]	$ 18,849	[4]	$ 0	[4]	$ 0	[4]	$ 0	[4]	$ 0	[4]	$ 3,652	[5]	$ 3,370	[5]	$ 0	[5]	$ 0	[5]	$ 3,652	[5]	$ 3,370	[5]	$ 0	[5]	$ 0	[5]

[1] The majority of this category represents a fund with the objective of approximating the return of the S&P 500 Index. The remaining securities include both a large-value fund and a large-growth fund investing in diverse industries.

[2] This category includes both a mid-growth fund with the objective of outperforming the Russell Mid Cap Growth Index and a mid-value fund investing in diverse industries.

[3] This category includes both a small-value fund and a small-growth fund investing in diverse industries.

[4] This category includes intermediate and long-term investment grade bonds from diverse industries.

[5] This category represents a fund of well diversified mutual funds with the objective of providing a low-volatility means to access equity-like returns.