Goodwill and Other Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Goodwill [Abstract]
Balance - beginning of period	$ 113,059	$ 113,059
Goodwill acquisitions/divestitures during the year	55,432	0
Balance - end of period	168,491	113,059
Identifiable Intangible Assets [Abstract]
Balance - beginning of period	61,304	61,304
Identifiable intangible assets acquisitions/divestitures during the year	23,990	0
Balance - end of period	$ 85,294	$ 61,304