Earnings Per Share - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Aug. 31, 2020	May 31, 2020	Feb. 29, 2020	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Aug. 31, 2020	Aug. 31, 2019
Numerator:
Net income (loss) from continuing operations	$ (1,028)			$ 80,201			$ 16,127	$ 16,875
Net income (loss) from discontinued operations	0			70			(53)	36
Net income (loss)	(1,028)	$ 4,662	$ 12,438	80,271	$ (25,884)	$ (37,476)	16,074	16,911
Add back convertible notes interest	0			1,095			2,996	3,270
Numerator for diluted earnings per share - net income (loss) attributable to common stockholders	$ (1,028)			$ 81,296			$ 19,123	$ 20,145
Basic income (loss) per common share:
Basic income (loss) from continuing operations (in dollars per share)	$ (0.01)			$ 0.51			$ 0.10	$ 0.11
Basic income (loss) from discontinued operations (in dollars per share)	0			0			0	0
Net income (loss) - basic (in dollars per share)	(0.01)			0.51			0.10	0.11
Diluted income (loss) per common share:
Diluted income (loss) from continuing operations (in dollars per share)	(0.01)			0.41			0.09	0.10
Diluted income (loss) from discontinued operations (in dollars per share)	0			0			0	0
Net income (loss) - diluted (in dollars per share)	$ (0.01)			$ 0.41			$ 0.09	$ 0.10
Denominator:
Basic (in shares)	157,655,140			156,968,470			157,624,241	156,949,425
Diluted (in shares)	157,655,140			195,979,957			206,696,703	194,867,908