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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Nov. 02, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Oct. 01, 2021
Subsequent Event [Line Items]          
Cash dividends declared (in dollars per share)   $ 1.04 $ 1.04 $ 1.04  
Subsequent Event          
Subsequent Event [Line Items]          
Cash dividends declared (in dollars per share) $ 0.26        
Subsequent Event | Industrial Development Revenue Bonds          
Subsequent Event [Line Items]          
Final annual redemption         $ 0.4