Business Combinations and Divestitures (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Business Combinations [Abstract]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest	$ 28,952
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	5,660
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	489
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	331
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	18,276
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	10,117
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	(3,802)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	(170)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Current	(1,949)
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 3,916
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years 9 months 18 days
Business Combination, Acquired Receivable, Fair Value	$ 3,190
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	21,836
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	812
Business Acquisition, Pro Forma Revenue	1,208,020	$ 1,118,460
Business Acquisition, Pro Forma Net Income (Loss)	$ 43,285	$ 34,967