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Earnings Per Share - Additional Information (Detail) - shares
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share [Abstract]      
Weighted average basis attributable to antidilutive outstanding stock options and restricted stock units not included in the calculation of diluted earnings per share 47,000 42,000 8.58