Goodwill and Other Identifiable Intangible Assets (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2020 USD ($) Acquisition	Sep. 30, 2019 USD ($)
Goodwill and Other Identifiable Intangible Assets [Abstract]
Number of acquisitions | Acquisition	0
Goodwill [Abstract]
Balance	$ 113,059	$ 96,180
Goodwill acquisitions/divestitures during the year	0	16,879
Balance	113,059	113,059
Identifiable Intangible Assets [Abstract]
Balance	61,304	47,732
Identifiable intangible assets acquisitions/divestitures during the year	0	13,572
Balance	$ 61,304	$ 61,304