Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 29, 2012	Nov. 30, 2011
Debt Instrument [Line Items]
Long-term debt	$ 346,015	$ 316,152
Less: current portion	2,275	2,264
Long-Term Debt	343,740	313,888
5.4 percent Senior Notes
Debt Instrument [Line Items]
Long-term debt	87,026	87,024
4.6 percent Senior Notes
Debt Instrument [Line Items]
Long-term debt	65,000	65,000
4.8 percent Revenue Bonds
Debt Instrument [Line Items]
Long-term debt	1,191	1,262
6.3 percent Term Loan
Debt Instrument [Line Items]
Long-term debt	50,581	50,667
TIF bond debt service funding commitment
Debt Instrument [Line Items]
Long-term debt	62,217	62,199
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 80,000	$ 50,000