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Significant Accounting Policies - Fiscal Year (Details)	12 Months Ended
Significant Accounting Policies - Fiscal Year (Details)	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Length of fiscal year	364 days	371 days	364 days
Minimum
Length of fiscal year	364 days
Maximum
Length of fiscal year	371 days