Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Nov. 30, 2015	Nov. 30, 2014
Allowance for receivables	$ 1,000	$ 1,000
Class A Common Stock
Common Stock, par value (in per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	80,000,000	80,000,000
Common Stock, shares issued (in shares)	26,348,051	26,248,081
Common Stock, shares outstanding (in shares)	26,348,051	26,248,081
Class B Common Stock
Common Stock, par value (in per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	40,000,000	40,000,000
Common Stock, shares issued (in shares)	19,942,136	19,967,202
Common Stock, shares outstanding (in shares)	19,942,136	19,967,202