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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Current Assets:    
Allowance for accounts receivable $ 9,927 $ 6,217
Common stock, $.10 par value, 160,000,000 shares authorized, 112,080,262 and 112,008,961 shares issued as of September 30, 2019 and 2018, respectively, and 108,437,904 and 108,993,718 shares outstanding as of September 30, 2019 and 2018, respectively    
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) 112,080,262 112,008,961
Common stock, shares outstanding (in shares) 108,437,904 108,993,718
Preferred stock, no par value, 1,000,000 shares authorized, no shares issued    
Preferred stock, no par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 0 0
Treasury stock, at cost, 3,642,358 shares and 3,015,243 shares as of September 30, 2019 and 2018, respectively    
Treasury stock (in shares) 3,642,358 3,015,243