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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2021
Sep. 30, 2021
Current assets:    
Allowance for doubtful accounts $ 3.8 $ 3.0
Stockholders’ equity:    
Common stock, par or stated value per share (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) 35,367,264 35,367,264
Treasury stock, shares (in shares) 1,302,757 1,313,690