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Shareholders' Equity (Tables)
 12 Months Ended
Sep. 30, 2023
Equity [Abstract]  
Changes in Shares of Common Stock
The following table shows the changes in shares of common stock for 2023, 2022 and 2021 (in thousands):
202320222021
Common stock outstanding, beginning balances15,943,425 16,426,786 16,976,763 
Common stock repurchased(471,419)(568,589)(656,340)
Common stock issued, net of shares withheld for employee taxes78,055 85,228 106,363 
Common stock outstanding, ending balances15,550,061 15,943,425 16,426,786