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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2015
Sep. 30, 2015
Consolidated Balance Sheets    
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 152,452,910 151,263,650
Common stock, outstanding shares 152,452,910 151,263,650