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Acquisitions (Details) $ in Thousands					1 Months Ended		12 Months Ended
Acquisitions (Details) $ in Thousands	Jul. 02, 2019 USD ($)	Mar. 14, 2018 USD ($)	May 08, 2017 USD ($)	Nov. 07, 2016 USD ($) a	Aug. 30, 2017 USD ($)	May 25, 2017 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Business Acquisition [Line Items]
Purchase price, net of cash acquired	$ 95,000		$ 38,600	$ 75,000			$ 96,777	$ 11,445	$ 198,628
Revenues	37,000
Payments to Acquire Businesses, Gross					$ 36,000	$ 48,800
Deferred Tax Liabilities, Goodwill							2,673	969
Goodwill		$ 3,500	7,500	30,100	10,700	4,800	$ 409,215	$ 381,652	$ 377,900
Customer contract assets	2,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	28,500			4,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings					18,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	59,700		17,200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	6,300	200	9,400	16,600	300	1,700
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities				$ 15,700
Area of Land \| a				130,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables			4,100	$ 7,400	1,800	2,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	3,500	1,100	5,100	11,000	2,100	5,200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation			8,900	2,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets			400	9,500		400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	10,500	400	4,300		200	4,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	3,700	1,200	8,100		$ 3,200	35,600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			$ 1,500
Customer relationships
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				$ 32,800
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				20 years
Mayday Manufacturing Co [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets				$ 300
Morgan Schaffer Inc [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles						$ 3,600
Morgan Schaffer Inc [Member] \| Customer Relationships and Developed Technology [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life						10 years
NRG Systems Inc [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			14 years
Vanguard Instruments Company [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					15 years
Manta Test Systems Inc [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		9,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings		3,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables		$ 400
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		13 years
Globe Composite Solutions, LLC [Member]
Business Acquisition [Line Items]
Deferred Tax Liabilities, Goodwill	25,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings	56,700
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	$ 3,500
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	20 years