Benefit Plans (Details 17) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 30, 2012
Accumulated other comprehensive loss that are expected to be recognized as components of net periodic cost
Actuarial loss	$ 6,059
Prior service cost (credit)	(1,496)
Net periodic benefit expected to be recognized	4,563
Pension Plan [Member]
Accumulated other comprehensive loss that are expected to be recognized as components of net periodic cost
Actuarial loss	3,349
Prior service cost (credit)	17
Net periodic benefit expected to be recognized	3,366
Postretirement Medical [Member]
Accumulated other comprehensive loss that are expected to be recognized as components of net periodic cost
Actuarial loss	2,710
Prior service cost (credit)	(1,513)
Net periodic benefit expected to be recognized	$ 1,197

The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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- Definition

The aggregate amount in accumulated other comprehensive income expected to be recognized as a component of net periodic benefit cost over the fiscal year that follows the most recent annual statement of financial position presented, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.

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