Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 12,031	$ 265	$ 198,047	$ 34,765
Other comprehensive income:
Amortization of terminated interest rate swap, net of tax benefit	200	167	589	501
Comprehensive income	$ 12,231	$ 432	$ 198,636	$ 35,266