Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Feb. 28, 2018	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Operating Loss Carryforwards [Line Items]
Statutory rate		35.00%	35.00%	35.00%
Deferred tax assets, valuation allowance		$ 6,423	$ 5,773
Reversal of valuation allowance		(700)	200
Unrecognized tax benefits that would impact effective tax rate if recognized		8,000
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		34,100	$ 1,800
Net operating loss carryforward, term			20 years
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		$ 66,200	$ 90,600
State | Minimum
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward, term			5 years
State | Maximum
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward, term			20 years
Forecast
Operating Loss Carryforwards [Line Items]
Impairment of deferred tax asset	$ 70,000