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Pension and Other Postretirement Plans (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 03, 2011	Nov. 27, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at end of year	$ 112,548	$ 100,866
Real estate funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at end of year	3,782	3,203
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at end of year	3,782	3,203
Fair Value, Inputs, Level 3 [Member] \| Real estate funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at beginning of year	3,203	3,053
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Unrealized Gains (Losses), Included in Earnings, Net	579	150
Fair value of plan assets at end of year	$ 3,782	$ 3,203

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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