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Segment Information (Consolidated Net Sales and Earnings by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 588,117 | $ 548,622 |  | $ 1,606,514 | $ 1,491,897
Interest expense, net | (7,536) | (6,411) |  | (20,139) | (19,162)
Consolidated earnings before income taxes | 54,417 | 68,687 |  | 140,551 | 165,982
Restructuring Costs |  |  | $ 17,013 | 17,013 |
Aerospace [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 404,612 | 355,992 |  | 1,096,860 | 943,198
Segment earnings (loss) | 82,199 | 67,173 |  | 198,721 | 172,277
Industrial [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 183,505 | 192,630 |  | 509,654 | 548,699
Segment earnings (loss) | 10,450 | 20,870 |  | 40,031 | 55,957
Unallocated Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment earnings (loss) | $ (30,696) | $ (12,945) |  | $ (78,062) | $ (43,090)

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