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Segment Information (Consolidated Net Sales and Earnings by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 548,249 | $ 500,381 | $ 1,018,397 | $ 943,275
Interest expense, net | (6,216) | (6,316) | (12,603) | (12,751)
Consolidated earnings before income taxes | 48,647 | 50,236 | 86,134 | 97,295
Aerospace [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 386,343 | 320,526 | 692,248 | 587,206
Segment earnings (loss) | 72,969 | 58,227 | 116,522 | 105,104
Industrial [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 161,906 | 179,855 | 326,149 | 356,069
Segment earnings (loss) | 10,237 | 17,089 | 29,581 | 35,087
Unallocated Corporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment earnings (loss) | $ (28,343) | $ (18,764) | $ (47,366) | $ (30,145)

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