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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2021
Sep. 30, 2020
Statement of Financial Position [Abstract]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares 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) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 88,857,000 88,857,000
Common stock, shares outstanding (in shares) 27,568,000 29,096,000
Treasury stock, shares 61,289,000 59,761,000