Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Nov. 30, 2016	Nov. 30, 2015
Statement of Financial Position [Abstract]
Allowances on accounts receivable	$ 1,143	$ 2,193
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	48,536,516	50,579,539
Common stock, shares outstanding	48,536,516	50,579,539