Goodwill and Other Identifiable Intangible Assets (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2021 USD ($)
Goodwill [Abstract]
Balance - beginning of period	$ 168,491
Goodwill acquisitions during the three months ended December 31, 2021	251,184
Balance - end of period	419,675
Identifiable Intangible Assets [Abstract]
Balance - beginning of period	85,294
Acquired identifiable intangible assets during the three months ended December 31, 2021	35,950
Balance - end of period	$ 121,244