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Segment Information (Consolidated Net Sales and Earnings by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |
Net sales | $ 470,148 | $ 442,894
Interest expense, net | (6,387) | (6,435)
Consolidated earnings before income taxes | 37,487 | 47,059
Aerospace [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 305,905 | 266,680
Segment earnings (loss) | 43,553 | 46,877
Industrial [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 164,243 | 176,214
Segment earnings (loss) | 19,344 | 17,998
Unallocated Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment earnings (loss) | $ (19,023) | $ (11,381)

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