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Acquisitions (Details) - USD ($) $ in Thousands				3 Months Ended		11 Months Ended	12 Months Ended
	Nov. 09, 2023	Feb. 01, 2023	Nov. 04, 2021	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Acquisitions
Payments to acquire businesses net of cash acquired							$ 56,383	$ 17,694	$ 10,906
Goodwill	$ 30,600
Working capital settlement					$ 200
Goodwill						$ 539,899	539,899	503,177	492,700
Revenues							1,026,759	956,033	$ 857,502
Goodwill, tax deductible expenses						15,416	$ 15,416	$ 13,313
MPE Limited (MPE)
Acquisitions
Payments to acquire businesses net of cash acquired	56,200
Fair value of accounts receivable acquired	400
Fair value of inventory acquired	1,100
Fair value of property, plant and equipment acquired	1,700
Fair value of accounts payable and accrued expenses acquired	700
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities	8,100
Business combination recognized identifiable assets acquired and liabilities assumed finite-lived intangibles	29,100
Working capital settlement				$ 200
Revenues						$ 10,000
CMT Materials, LLC and its affiliate Engineered Syntactic Systems, LLC
Acquisitions
Payments to acquire businesses net of cash acquired		$ 18,000
Fair value of accounts receivable acquired		1,700
Fair value of inventory acquired		3,000
Fair value of property, plant and equipment acquired		1,300
Fair value of accounts payable and accrued expenses acquired		1,200
Fair value of identifiable intangible assets acquired		7,300
Goodwill		5,600
Networks electronic company
Acquisitions
Payments to acquire businesses net of cash acquired			$ 15,400
Fair value of accounts receivable acquired			600
Fair value of inventory acquired			1,500
Fair value of property, plant and equipment acquired			200
Fair value of identifiable intangible assets acquired			8,100
Goodwill			5,600
Goodwill			5,700
Business combination recognized identifiable assets acquired and liabilities assumed current liabilities accounts payable			700
Customer Relationships | MPE Limited (MPE)
Acquisitions
Fair value of identifiable intangible assets acquired	$ 31,100
Customer Relationships | CMT Materials, LLC and its affiliate Engineered Syntactic Systems, LLC
Acquisitions
Business combination recognized identifiable assets acquired and liabilities assumed finite-lived intangibles		$ 6,200
Customer Relationships | Networks electronic company
Acquisitions
Business combination recognized identifiable assets acquired and liabilities assumed indefinite-lived intangible assets			$ 6,300

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