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Segment Information (Summary of Consolidated Net Sales and Earnings by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |
Consolidated net sales | $ 720,355 | $ 652,811
Interest expense, net | (8,522) | (11,507)
Consolidated earnings before income taxes | 61,548 | 61,515
Aerospace [Member] |  |
Segment Reporting Information [Line Items] |  |
Consolidated net sales | 473,925 | 392,887
Industrial [Member] |  |
Segment Reporting Information [Line Items] |  |
Consolidated net sales | 246,430 | 259,924
Operating Segments [Member] | Aerospace [Member] |  |
Segment Reporting Information [Line Items] |  |
Consolidated net sales | 473,925 | 392,887
Segment earnings (loss) | 92,911 | 72,854
Operating Segments [Member] | Industrial [Member] |  |
Segment Reporting Information [Line Items] |  |
Consolidated net sales | 246,430 | 259,924
Segment earnings (loss) | 28,230 | 29,169
Unallocated Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment earnings (loss) | $ (51,071) | $ (29,001)

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