Earnings Per Share (Calculation of Basic and Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Nov. 30, 2014	Aug. 31, 2014	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2012
Earnings Per Share [Abstract]
Income from continuing operations (in dollars)	$ 14,464	$ 11,095	$ 12,799	$ 11,100	$ 14,618	$ 7,204	$ 8,142	$ 9,813	$ 49,458	$ 39,777	$ 44,954
Weighted average shares outstanding (in shares)									50,840	54,516	62,881
Dilutive impact from common stock equivalents (in shares)									626	863	860
Diluted weighted average shares outstanding (in shares)									51,466	55,379	63,741
Basic earnings per share from continuing operations (in dollars per share)	$ 0.29	$ 0.22	$ 0.25	$ 0.22	$ 0.28	$ 0.13	$ 0.15	$ 0.17	$ 0.97	$ 0.73	$ 0.71
Diluted earnings per share from continuing operations (in dollars per share)	$ 0.28	$ 0.22	$ 0.25	$ 0.21	$ 0.28	$ 0.13	$ 0.15	$ 0.17	$ 0.96	$ 0.72	$ 0.71