Supplemental Financial Statement Information - Cash flow, etc. (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	May 27, 2016	May 31, 2016	May 31, 2015	May 31, 2016	May 31, 2015	Nov. 30, 2015
Supplemental Cash Flow Information
Increase in value of available-for-sale securities: Investment in Centaur Media Plc				$ 521	$ 449
Increase (decrease) in accounts payable and accrued liabilities related to additions to real estate assets				2,576	2,767
Increase in accounts payable related to the repurchase of common stock		$ 1,951
Interest paid
Interest payments		1,125	$ 1,053	$ 2,236	$ 2,049
Income Taxes
Effective income tax rate (as a percent)				20.20%	36.30%
Deferred income taxes		$ 6,605		$ 6,605		$ 5,838
Common Stock
Supplemental Cash Flow Information
Stock repurchased (in shares)	60,000