CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Dec. 31, 2017	Sep. 30, 2017
Statement of Financial Position [Abstract]
Common stock, par value (usd per share)	$ 2.50	$ 2.50
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares outstanding (in shares)	87,475,456	86,555,507
Treasury stock at cost and other, shares (in shares)	2,507,313	2,347,380