Long-Term Debt - Nonprinting (Detail)	3 Months Ended		6 Months Ended
	May. 31, 2015 USD ($) Year	May. 31, 2014 USD ($)	May. 31, 2015 USD ($) Year	May. 31, 2014 USD ($)	Nov. 30, 2014 USD ($)
Debt Disclosure [Line Items]
Long-term debt	$ 271,218,000		$ 271,218,000		$ 271,746,000
Stockholders' Equity Attributable to Parent	1,363,066,000		1,363,066,000		1,346,432,000
Interest expense	2,602,000	$ 2,703,000	4,070,000	$ 5,836,000
Financing costs deferred	$ 3,400,000		3,400,000		$ 3,700,000
4.63 percent Senior Notes
Debt Disclosure [Line Items]
Proceeds from long-term debt			$ 65,000,000
Debt, interest rate	4.63%		4.63%		4.63%
Frequency of periodic payment			semi-annual
Debt Instrument, Covenant, Leverage Ratio, Maximum	3.50		3.50
Debt Instrument, Covenant, Interest Coverage Ratio, Maximum	2.0		2.0
Debt Instrument, Covenant Consolidated Net Worth, Percentage, Maximum	15.00%		15.00%
Long-term debt	$ 65,000,000		$ 65,000,000		$ 65,000,000
4.63 percent Senior Notes | Semi Annual Payment, First Payment
Debt Disclosure [Line Items]
Debt Instrument Interest Rate Payment Date			January 18
4.63 percent Senior Notes | Semi Annual Payment, Second Payment
Debt Disclosure [Line Items]
Debt Instrument Interest Rate Payment Date			July 18
3.95 percent Senior Notes
Debt Disclosure [Line Items]
Proceeds from long-term debt			$ 100,000,000
Debt, interest rate	3.95%		3.95%		3.95%
Frequency of periodic payment			semi-annual
Debt Instrument, Covenant, Leverage Ratio, Maximum	3.50		3.50
Debt Instrument, Covenant Consolidated Net Worth, Percentage, Maximum	15.00%		15.00%
Long-term debt	$ 100,000,000		$ 100,000,000		$ 100,000,000
3.95 percent Senior Notes | Semi Annual Payment, First Payment
Debt Disclosure [Line Items]
Debt Instrument Interest Rate Payment Date			March 13
3.95 percent Senior Notes | Semi Annual Payment, Second Payment
Debt Disclosure [Line Items]
Debt Instrument Interest Rate Payment Date			September 13
4.82 percent Revenue Bonds
Debt Disclosure [Line Items]
Debt, interest rate	4.82%		4.82%		4.82%
Long-term debt	$ 172,000		$ 172,000		$ 339,000
Debt, monthly payment			$ 29,000
6.25 percent Term Loan
Debt Disclosure [Line Items]
Debt, interest rate	6.25%		6.25%		6.25%
Long-term debt	$ 49,131,000		$ 49,131,000		$ 49,524,000
Debt, monthly payment			$ 323,000
Debt term | Year	25		25
TIF bond debt service funding commitment
Debt Disclosure [Line Items]
Long-term debt	$ 56,915,000		$ 56,915,000		56,883,000
Principal payment date			October 1
TIF bond debt service funding commitment | Semi Annual Payment, First Payment
Debt Disclosure [Line Items]
Debt Instrument Interest Rate Payment Date			April 1
TIF bond debt service funding commitment | Semi Annual Payment, Second Payment
Debt Disclosure [Line Items]
Debt Instrument Interest Rate Payment Date			October 1
TIF bond debt service funding commitment | Term Bond Due December 1st 2017
Debt Disclosure [Line Items]
Debt, interest rate	6.15%		6.15%
Long-term debt	$ 7,700,000		$ 7,700,000
Debt, maturity date			Dec. 01, 2017
TIF bond debt service funding commitment | Term Bond Due December 1st 2027
Debt Disclosure [Line Items]
Debt, interest rate	6.75%		6.75%
Long-term debt	$ 49,700,000		$ 49,700,000
Debt, maturity date			Dec. 01, 2027
2012 Credit Facility
Debt Disclosure [Line Items]
Debt Instrument, Covenant, Leverage Ratio, Maximum	3.50		3.50
Debt Instrument, Covenant, Interest Coverage Ratio, Maximum	2.5		2.5
Credit Facility current borrowing capacity	$ 300,000,000		$ 300,000,000
Credit Facility potential borrowing capacity	500,000,000		$ 500,000,000
Debt instrument basis points			0.50%
Credit Facility amount outstanding	0		$ 0
2012 Credit Facility | Minimum
Debt Disclosure [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.125%
2012 Credit Facility | Maximum
Debt Disclosure [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.225%
2012 Credit Facility | Standby Letters of Credit [Member]
Debt Disclosure [Line Items]
Credit Facility current borrowing capacity	25,000,000		$ 25,000,000
2012 Credit Facility | Swing Line Loan [Member]
Debt Disclosure [Line Items]
Credit Facility current borrowing capacity	$ 10,000,000		$ 10,000,000
Four Quarters Ending after any Permitted Acquisition [Member]
Debt Disclosure [Line Items]
Debt Instrument, Covenant, Leverage Ratio, Maximum	4.0		4.0
Accumulated Other Comprehensive Loss
Debt Disclosure [Line Items]
Stockholders' Equity Attributable to Parent	$ (3,652,000)		$ (3,652,000)		$ (3,981,000)
London Interbank Offered Rate (LIBOR) [Member] | 2012 Credit Facility
Debt Disclosure [Line Items]
Debt instrument basis points			1.00%
London Interbank Offered Rate (LIBOR) [Member] | 2012 Credit Facility | Minimum
Debt Disclosure [Line Items]
Debt instrument basis points			1.00%
London Interbank Offered Rate (LIBOR) [Member] | 2012 Credit Facility | Maximum
Debt Disclosure [Line Items]
Debt instrument basis points			1.625%