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Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2019
Sep. 30, 2018
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 157,482,983 156,983,356
Common stock, outstanding shares 157,482,983 156,983,356