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Business Segment Information - Net Sales And Earnings Before Income Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 208,030 | $ 172,665 | $ 180,492 | $ 171,728 | $ 213,177 | $ 178,259 | $ 171,243 | $ 163,365 | $ 732,915 | $ 726,044 | $ 683,650
Consolidated EBIT |  |  |  |  |  |  |  |  | 46,500 | 106,000 | 89,900
Less: interest expense |  |  |  |  |  |  |  |  | (6,730) | (8,092) | (8,798)
Earnings before income taxes |  |  |  |  |  |  |  |  | 39,743 | 97,877 | 81,091
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated EBIT |  |  |  |  |  |  |  |  | (78,300) | (41,900) | (35,800)
Aerospace & Defense |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 354,320 | 325,700 | 286,800
Consolidated EBIT |  |  |  |  |  |  |  |  | 73,200 | 70,100 | 58,700
USG |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 191,703 | 211,900 | 214,000
Consolidated EBIT |  |  |  |  |  |  |  |  | 24,400 | 52,200 | 43,200
Test |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 186,892 | 188,400 | 182,900
Consolidated EBIT |  |  |  |  |  |  |  |  | $ 27,200 | $ 25,600 | $ 23,800

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