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Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2013
Sep. 30, 2012
Consolidated Balance Sheets    
Preferred stock, authorized shares 20 20
Preferred stock, issued shares 2 3
Preferred stock, outstanding shares 2 3
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, liquidation preference value (in dollars per share) $ 1.00 $ 1.00
Common stock, authorized shares 300,000,000 300,000,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, issued shares 99,364,985 107,041,003
Common stock, outstanding shares 99,364,985 107,041,003