Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2017	Feb. 29, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 21,273	$ 19,831
Other comprehensive income:
Amortization of terminated interest rate swap, net of tax benefit of $105 and $103, respectively	167	165
Comprehensive income	$ 21,440	$ 19,996