Long-Term Debt, Additional Information (Detail)	May. 31, 2015	Nov. 30, 2014
4.63 percent Senior Notes
Debt Instrument [Line Items]
Debt, interest rate	4.63%	4.63%
3.95 percent Senior Notes
Debt Instrument [Line Items]
Debt, interest rate	3.95%	3.95%
4.82 percent Revenue Bonds
Debt Instrument [Line Items]
Debt, interest rate	4.82%	4.82%
6.25 percent Term Loan
Debt Instrument [Line Items]
Debt, interest rate	6.25%	6.25%