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Retirement Plans (Summary of Changes in Fair Value of Level 3 Assets) (Details) (Pension Plans, Defined Benefit [Member], USD $) In Thousands, unless otherwise specified								12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013 Alternative investments [Member]	Dec. 29, 2012 Alternative investments [Member]	Dec. 28, 2013 Level 3 [Member]	Dec. 29, 2012 Level 3 [Member]	Dec. 28, 2013 Level 3 [Member] Alternative investments [Member]	Dec. 29, 2012 Level 3 [Member] Alternative investments [Member]
Fair Value of Level 3 Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 260,917	$ 231,897	$ 210,577	$ 53,116	$ 46,297	$ 53,116	$ 46,297	$ 46,297	$ 28,762
Purchases, sales and settlements								0	14,056
Unrealized gains								6,819	3,479
Fair value of plan assets at end of year	$ 260,917	$ 231,897	$ 210,577	$ 53,116	$ 46,297	$ 53,116	$ 46,297	$ 53,116	$ 46,297

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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