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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2017
Sep. 30, 2016
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 2.50 $ 2.50
Common stock, shares authorized (in shares) 150,000,000 150,000,000
Common stock, shares outstanding (in shares) 86,555,507 86,086,355
Treasury stock at cost and other (in shares) 2,347,380 2,575,139