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Goodwill and Other Intangible Assets - Changes in carrying amount of goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Changes in goodwill |  |
Goodwill, Beginning Balance | $ 390,256 | $ 361,900
Acquisition activity and other |  | (28,400)
Out-of-period adjustment | 18,000 |
Foreign currency translation and other | (200) |
Goodwill, Ending Balance | 408,063 | 390,256
Aerospace & Defense |  |
Changes in goodwill |  |
Goodwill, Beginning Balance | 102,200 | 73,700
Acquisition activity and other |  | (28,500)
Foreign currency translation and other | (100) |
Goodwill, Ending Balance | 102,100 | 102,200
USG |  |
Changes in goodwill |  |
Goodwill, Beginning Balance | 254,000 | 254,100
Acquisition activity and other |  | (100)
Out-of-period adjustment | 18,000 |
Foreign currency translation and other | (100) |
Goodwill, Ending Balance | 271,900 | 254,000
Test |  |
Changes in goodwill |  |
Goodwill, Beginning Balance | 34,100 | 34,100
Acquisition activity and other |  | 0
Out-of-period adjustment | 0 |
Foreign currency translation and other | 0 |
Goodwill, Ending Balance | $ 34,100 | $ 34,100

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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