Annual report pursuant to Section 13 and 15(d)

Stockholders Equity (Details)

v2.4.0.8
Stockholders Equity (Details) (USD $)
 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Class A Common Stock
Vote
Dec. 31, 2012
Class A Common Stock
Dec. 31, 2013
Class B Common Stock
Vote
Dec. 31, 2012
Class B Common Stock
Dec. 31, 2013
Preferred Stock
Class of Stock [Line Items]                
Common stock, shares authorized (in shares)       500,000,000 500,000,000 144,000,000 144,000,000  
Common stock, par value (in dollars per share)     $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001  
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000           5,000,000
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001           $ 0.0001
Number of Votes Per Share       1   5    
Shares retired during the year (in shares)       4,833,284