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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Current Assets:    
Allowance for accounts receivable $ 2,068 $ 1,820
Common Stock    
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized (in shares) 160,000,000 160,000,000
Common stock, shares issued (in shares) 112,222,865 112,151,563
Common stock, shares outstanding (in shares) 107,898,859 107,488,242
Preferred Stock    
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 0 0
Treasury Stock    
Treasury stock (in shares) 4,324,006 4,663,321