Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Goodwill [Line Items]
Finite-lived intangibles estimated useful lives	10 years
Goodwill	$ 65,643,000	$ 67,144,000	$ 52,758,000
Goodwill impairment loss	0	0
Uncertain tax positions	0	0
Tax interest	0	0
Tax penalties	0	$ 0
FDIC insurance limit amount	$ 250,000
Treasury stock (shares)	0
Authorized shares of preferred stock (shares)	5,000,000
Issued preferred stock (shares)	0
Stock Options
Goodwill [Line Items]
Number of options authorized for issuance (in shares)	0
Expiration term of options	10 years
Minimum
Goodwill [Line Items]
Estimated useful lives of property and equipment	3 years
Maximum
Goodwill [Line Items]
Estimated useful lives of property and equipment	7 years