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Business Segment Information - Capital Expenditures (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Capital Expenditures | $ 32,108 | $ 24,229 | $ 15,243
Corporate |  |  |
Capital Expenditures | 200 | 0 | 0
Aerospace & Defense |  |  |
Capital Expenditures | 15,900 | 11,700 | 7,000
USG |  |  |
Capital Expenditures | 12,400 | 8,500 | 5,200
Test |  |  |
Capital Expenditures | $ 3,600 | $ 4,000 | $ 3,000

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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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