Supplemental Financial Statement Information - Cash flow, etc. (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 26, 2019	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Supplemental Cash Flow Information
Treasury shares		20,601	22,390	20,601	22,390
Treasury stock		$ 1,079	$ 846	$ 1,079	$ 846
Increase (decrease) in accounts payable and accrued liabilities related to additions to real estate assets				(1,221)	1,483
Deferred Compensation Plan
Decrease in deferred compensation liability				1,927
Interest paid
Interest payments		1,750	1,609	$ 5,183	$ 4,828
Income tax rate
Income tax benefit rate (as a percent)				16.60%	23.40%
Income Taxes
Income tax benefit (provision)		(291)	(814)	$ (562)	$ 689
Current income tax expense					1,621
Income tax benefit due to permanent differences				368
Pretax income (loss)		$ (932)	$ 203	(2,216)	6,939
Benefit arising from partial reduction of valuation allowance on deferred tax assets					873
Income tax benefit from exercise of stock options				$ 194	$ 59
Capital based tax phasing period	4 years