Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Nov. 30, 2014	Nov. 30, 2013
Allowance for receivables	$ 1,000	$ 1,000
Class A Common Stock
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	80,000,000	80,000,000
Common Stock, shares issued	26,248,081	26,182,518
Common Stock, shares outstanding	26,248,081	26,182,518
Class B Common Stock
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	40,000,000	40,000,000
Common Stock, shares issued	19,967,202	19,994,663
Common Stock, shares outstanding	19,967,202	19,994,663