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Significant Accounting Policies - Fiscal Year (Details)
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Significant Accounting Policies      
Length of fiscal year 364 days 364 days 364 days
Minimum      
Significant Accounting Policies      
Length of fiscal year 364 days    
Maximum      
Significant Accounting Policies      
Length of fiscal year 371 days