Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Nov. 30, 2012	Feb. 29, 2012
Class A Common Stock [Member]
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	322,000,000	322,000,000
Common Stock, shares issued	240,938,228	233,751,797
Treasury Stock, shares at cost	80,890,718	63,015,441
Class B Convertible Common Stock [Member]
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	30,000,000	30,000,000
Common Stock, shares issued	28,526,035	28,583,916
Treasury Stock, shares at cost	5,005,800	5,005,800