Acquisitions Details (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Nov. 01, 2021	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Business Acquisition [Line Items]
Goodwill		$ 341,645		$ 341,645		$ 225,522
Operating lease right-of-use assets		15,435		15,435		15,684
Operating lease liability		17,625		17,625		$ 18,368
Ventus
Business Acquisition [Line Items]
Cash paid at closing	$ 350,000
Goodwill	$ 116,890
Weighted average useful life identifiable intangibles	19 years 2 months 12 days
Net income		$ 2,578	$ 2,058	(1,075)	$ (5,725)
Ventus | Customer Relationships
Business Acquisition [Line Items]
Weighted average useful life identifiable intangibles	20 years 6 months
Ventus | Trademarks
Business Acquisition [Line Items]
Weighted average useful life identifiable intangibles	13 years
Ventus | Purchased and Core Technology
Business Acquisition [Line Items]
Weighted average useful life identifiable intangibles	11 years
Ventus | General and Administrative
Business Acquisition [Line Items]
Acquisition costs				$ 4,000
Other non-current assets | Ventus
Business Acquisition [Line Items]
Operating lease right-of-use assets	$ 900
Other current liabilities and other noncurrent liabilities | Ventus
Business Acquisition [Line Items]
Operating lease liability	$ 900