Accounts Payable and Accrued Liabilities (Details 1) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2013	Dec. 01, 2012
Accounts Payable and Accrued Liabilities [Line Items]
Accounts payable	$ 79,164	$ 69,206
Accrued salaries, wages and commissions	14,908	16,884
Pension and postretirement healthcare benefits liabilities	278	21,442
Compensated absences	8,600	9,010
Accrued insurance liabilities	7,599	7,733
Customer deposits	16,081	14,207
Other accrued liabilities	30,908	33,780
Accounts payable and accrued liabilities	157,538	172,262
Chief Executive Officer, Retired [Member]
Accounts Payable and Accrued Liabilities [Line Items]
Pension and postretirement healthcare benefits liabilities		$ 21,034