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Supplemental Quarterly Financial Data (Unaudited) (Quarterly Financial Information - Segment Reporting) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Supplemental Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 606,788 | $ 548,622 | $ 500,381 | $ 442,894 | $ 590,922 | $ 507,664 | $ 479,382 | $ 445,110 | $ 2,098,685 | $ 2,023,078 | $ 2,038,303
Interest expense, net | (6,543) | (6,411) | (6,316) | (6,435) | (6,585) | (5,912) | (5,793) | (6,461) | (25,705) | (24,751) | (24,077)
Consolidated earnings before income taxes | 86,765 | 68,687 | 50,236 | 47,059 | 80,756 | 63,408 | 54,366 | 27,956 | 252,747 | 226,486 | 240,949
Aerospace [Member] |  |  |  |  |  |  |  |  |  |  |
Supplemental Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | 399,141 | 355,992 | 320,526 | 266,680 | 365,305 | 308,582 | 290,690 | 268,599 | 1,342,339 | 1,233,176 | 1,160,883
Segment earnings (loss) | 85,536 | 67,173 | 58,227 | 46,877 | 80,376 | 57,726 | 50,578 | 43,486 | 257,813 | 232,166 | 187,747
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Supplemental Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | 207,647 | 192,630 | 179,855 | 176,214 | 225,617 | 199,082 | 188,692 | 176,511 | 756,346 | 789,902 | 877,420
Segment earnings (loss) | 23,034 | 20,870 | 17,089 | 17,998 | 19,254 | 21,963 | 19,469 | 21,551 | 78,991 | 82,237 | 126,641
Unallocated Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Supplemental Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment earnings (loss) | $ (15,262) | $ (12,945) | $ (18,764) | $ (11,381) | $ (12,289) | $ (10,369) | $ (9,888) | $ (30,620) | $ (58,352) | $ (63,166) | $ (49,362)

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