Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 13,355	$ 21,469	$ 28,308	$ 41,364
Other comprehensive income:
Amortization of terminated interest rate swap, net of tax benefit of $106, $106, $212 and $212, respectively	165	165	329	328
Comprehensive income	$ 13,520	$ 21,634	$ 28,637	$ 41,692