Long-Term Debt (Details 1) (USD $)	Nov. 30, 2013	Nov. 22, 2013	Dec. 01, 2012
Debt Instrument [Line Items]
Current portion of long-term debt	$ 50,223,000		$ 201,000
Long-term debt, less current portion	116,413,000		16,391,000
Maturities of Long-term Debt [Abstract]
2014	50,223,000
2015	226,000
2016	8,635,000
2017	100,113,000
2018	29,000
Thereafter	7,410,000
Long-term debt	166,636,000		16,592,000
Letters of credit outstanding, amount	28,541,000		23,307,000
Industrial Revenue Bonds [Member]
Debt Instrument [Line Items]
Weighted average interest rate	0.23%		0.35%
Maturities of Long-term Debt [Abstract]
Long-term debt	15,820,000		15,820,000
Other long-term debt [Member]
Maturities of Long-term Debt [Abstract]
Long-term debt	816,000		772,000
Revolving Credit Facility [Member]
Maturities of Long-term Debt [Abstract]
Long-term debt	50,000,000		0
Term Loan [Member]
Maturities of Long-term Debt [Abstract]
Long-term debt	100,000,000	100,000,000	0
Credit Facility 2012 [Member] | Letter of Credit Subline [Member]
Maturities of Long-term Debt [Abstract]
Letters of credit outstanding, amount	$ 16,012,000		$ 16,012,000