Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	May 31, 2016	Nov. 30, 2015
Class A common stock, par value per share	$ 0.01	$ 0.01
Class A common stock, shares authorized	160,000,000	160,000,000
Class A common stock, shares issued	71,117,896	70,287,707
Class A common stock, shares outstanding	67,452,437	67,523,885
Treasury stock, shares	3,665,459	2,763,822