Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013	Nov. 30, 2012
Debt Instrument [Line Items]
Long-term debt	$ 276,783	$ 276,932
Less: current portion	2,522	2,513
Long-Term Debt	274,261	274,419
4.63 percent Senior Notes
Debt Instrument [Line Items]
Long-term debt	65,000	65,000
3.95 Senior Notes
Debt Instrument [Line Items]
Long-term debt	100,000	100,000
4.82 percent Revenue Bonds
Debt Instrument [Line Items]
Long-term debt	894	970
6.25 percent Term Loan
Debt Instrument [Line Items]
Long-term debt	50,228	50,318
TIF bond debt service funding commitment
Debt Instrument [Line Items]
Long-term debt	60,661	60,644
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 0	$ 0