Supplemental Financial Statement Information - Cash flow, etc. (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	May 27, 2016	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015	Nov. 30, 2015
Supplemental Cash Flow Information
Increase in value of available-for-sale securities: Investment in Centaur Media Plc				$ (912)	$ 638
Increase (decrease) in accounts payable and accrued liabilities related to additions to real estate assets				293	1,256
Interest paid
Interest payments		$ 1,098	$ 1,070	$ 3,334	$ 3,119
Income Taxes
Effective income tax rate (as a percent)				21.20%	28.90%
Effect of change in state law				$ 163
Reduction in effective tax rate, as a percent				16.80%
Deferred income taxes		$ 7,005		$ 7,005		$ 5,838
Number of years of cumulative pretax losses				3 years
Common Stock
Supplemental Cash Flow Information
Stock repurchased (in shares)	60,000