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Defined Benefit Plans (Details) (USD $)			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 26, 2012	Dec. 28, 2011	Sep. 26, 2012 Pension Plan [Member]	Sep. 28, 2011 Pension Plan [Member]	Sep. 26, 2012 Pension Plan [Member]	Sep. 28, 2011 Pension Plan [Member]	Sep. 26, 2012 Other Defined Benefit Plans [Member]	Sep. 28, 2011 Other Defined Benefit Plans [Member]	Sep. 26, 2012 Other Defined Benefit Plans [Member]	Sep. 28, 2011 Other Defined Benefit Plans [Member]
Components of net periodic benefit cost [Abstract]
Service cost			$ 95,000	$ 84,000	$ 285,000	$ 251,000	$ 0	$ 0	$ 0	$ 0
Interest cost			800,000	841,000	2,400,000	2,523,000	29,000	32,000	87,000	95,000
Expected return on plan assets			(1,024,000)	(1,046,000)	(3,042,000)	(3,137,000)	0	0	0	0
Amortization of net loss			441,000	251,000	1,322,000	753,000	13,000	8,000	39,000	24,000
Net periodic benefit cost			312,000	130,000	965,000	390,000	42,000	40,000	126,000	119,000
Contributions made to qualified pension plan and other defined benefit plans					2,800,000	1,500,000			100,000	100,000
Additional contribution made to other defined benefit plans							100,000		100,000
Additional minimum pension liability	$ 24,000,000	$ 24,800,000

X

- Definition

After tax amount of additional minimum pension liability not yet recognized as a net periodic pension cost.

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The amount of gains or losses recognized in net periodic benefit cost.

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The increase in the fair value of plan assets from contributions made by the employer.

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The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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