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Acquisitions (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 02, 2019 | Mar. 14, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |
Purchase price, net of cash acquired |  |  | $ 95,840 | $ 9,813 |
Deferred Tax Liabilities, Goodwill |  |  | 1,450 |  | $ 7,878
Goodwill |  |  | $ 390,256 | $ 361,900 | $ 408,063
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 28,500 |  |  |  |
Manta Test Systems Inc [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 9,500 |  |  |
Goodwill |  | 3,500 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings |  | 3,500 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 200 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  | 400 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory |  | $ 1,100 |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 13 years |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  | $ 400 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  | $ 1,200 |  |  |
Globe Composite Solutions, LLC [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price, net of cash acquired | 95,000 |  |  |  |
Revenues | 37,000 |  |  |  |
Deferred Tax Liabilities, Goodwill | 25,000 |  |  |  |
Customer contract assets | 2,800 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings | 56,700 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 59,700 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 6,300 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 3,500 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | $ 3,500 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 20 years |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | $ 10,500 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets | $ 3,700 |  |  |  |

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- Definition Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, from business combination. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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