Long-Term Debt (Details 2) (USD $)								12 Months Ended								12 Months Ended		12 Months Ended
	Nov. 30, 2013	Dec. 01, 2012	Nov. 30, 2013 Term Loan [Member]	Nov. 22, 2013 Term Loan [Member]	Dec. 01, 2012 Term Loan [Member]	Nov. 30, 2013 Revolving Credit Facility [Member]	Dec. 01, 2012 Revolving Credit Facility [Member]	Nov. 30, 2013 Credit Facility 2012 [Member]	Apr. 05, 2012 Credit Facility 2012 [Member]	Apr. 05, 2012 Credit Facility 2012 [Member] Credit Facility - Swing Line [Member]	Apr. 05, 2012 Credit Facility 2012 [Member] Credit Facility - Accordion [Member]	Nov. 30, 2013 Credit Facility 2012 [Member] Letter of Credit Sub-Facility [Member]	Dec. 01, 2012 Credit Facility 2012 [Member] Letter of Credit Sub-Facility [Member]	Nov. 30, 2013 Bonds [Member]	Dec. 01, 2012 Bonds [Member]	Nov. 30, 2013 Bonds [Member] Campbellsville-Taylor County Industrial Development Authority (Kentucky) [Member]	Dec. 01, 2012 Bonds [Member] Campbellsville-Taylor County Industrial Development Authority (Kentucky) [Member]	Nov. 30, 2013 Bonds [Member] South Dakota Economic Development Finance Authority [Member]	Dec. 01, 2012 Bonds [Member] South Dakota Economic Development Finance Authority [Member]
Line of Credit Facility [Line Items]
Line of credit, term								5 years
Maximum borrowing capacity									$ 150,000,000	$ 10,000,000	$ 100,000,000
Long-term debt	166,636,000	16,592,000	100,000,000	100,000,000	0	50,000,000	0							15,820,000	15,820,000	7,410,000	7,410,000	8,410,000	8,410,000
Weighted average interest rate			0.92%			0.71%
Remaining borrowing capacity						133,988,000
Sub-facility letters of credit maximum capacity												50,000,000
Letters of credit outstanding, amount	$ 28,541,000	$ 23,307,000										$ 16,012,000	$ 16,012,000
Debt instrument, maturity date																May 01, 2031		Feb. 01, 2016