Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 13,227	$ 21,898	$ 34,500	$ 41,729
Other comprehensive income:
Amortization of terminated interest rate swap, net of tax benefit of $209 and $207, respectively	167	167	334	332
Comprehensive income	$ 13,394	$ 22,065	$ 34,834	$ 42,061