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Business Segment Information - Schedule Of Depreciation And Amortization (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Depreciation and Amortization | $ 42,049 | $ 41,338 | $ 35,995
A&D |  |  |
Depreciation and Amortization | 10,400 | 9,400 | 8,300
USG |  |  |
Depreciation and Amortization | 13,500 | 14,400 | 11,300
Test |  |  |
Depreciation and Amortization | 5,200 | 5,000 | 5,100
Corporate, Non-Segment [Member] |  |  |
Depreciation and Amortization | $ 12,900 | $ 12,500 | $ 11,300

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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