Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Nov. 30, 2013	Nov. 30, 2012
Statement of Financial Position [Abstract]
Allowances on accounts receivable	$ 3,153	$ 3,024
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	51,512,595	59,594,961
Common stock, shares outstanding	51,512,595	59,594,961