Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 21,469	$ 22,440	$ 41,364	$ 35,953
Other comprehensive income:
Amortization of terminated interest rate swap, net of tax benefit of $106, $106, $212 and $212, respectively	165	165	328	329
Comprehensive income	21,634	22,605	41,692	36,282
Amortization of interest rate swap, net of tax benefit	$ 106	$ 106	$ 212	$ 212