Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details)	12 Months Ended
Sep. 30, 2021
Minimum
Goodwill [Line Items]
Useful lives of intangible assets	2 years
Maximum
Goodwill [Line Items]
Useful lives of intangible assets	20 years

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration