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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2017
Sep. 30, 2016
Statement Of Financial Position [Abstract]    
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred stock, authorized (in shares) 1,000,000 1,000,000
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, authorized (in shares) 240,000,000 240,000,000
Common stock, issued (in shares) 120,453,954 120,950,899
Common stock, outstanding (in shares) 120,453,954 120,950,899