Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

v3.8.0.1
Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2018
Sep. 30, 2017
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share)
Common stock, shares issued 63,900,000.0 63,700,000.0
Common stock, shares outstanding 62,700,000.0 63,000,000.0
Treasury stock, shares 1,200,000.0 700,000.0