Significant Accounting Policies (Details) - USD ($)	4 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Jun. 07, 2019	Sep. 30, 2017
Goodwill [Line Items]
Amortization of acquired identifiable intangible assets		$ 2,700,000	$ 1,800,000
Goodwill	$ 52,758,000	52,758,000	25,989,000		$ 25,989,000
Goodwill impairment loss		0	0
Uncertain tax positions	0	0	0
Tax interest		0	0
Tax penalties		0	$ 0
FDIC insurance limit amount	$ 250,000	$ 250,000
Employee Stock Option
Goodwill [Line Items]
Number of options that may be granted with a term of more than 10 years from date of grant (in shares)	0	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
S3
Goodwill [Line Items]
Amortization of acquired identifiable intangible assets	$ 1,000,000
Goodwill				$ 26,769,000