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Shareholders' Equity
 12 Months Ended
Sep. 30, 2021
Stockholders Equity Note [Abstract]  
Shareholders' Equity

20.    Shareholders’ Equity

In May 2019, the Company’s Board of Directors approved a Common Stock repurchase authorization of 10,000,000 shares. The Company repurchased 927,934 shares of its Common Stock under this authorization in fiscal 2021 at a cost of $107.8 million. The Company repurchased 550,853 shares of Common Stock under this authorization in fiscal 2020 at a cost of $40.8 million. The Company repurchased 4,866,532 shares of Common Stock under this authorization in fiscal 2019 at a cost of $350.1 million. The Company has remaining authority to repurchase 6,531,394 shares of Common Stock as of September 30, 2021.