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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, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Net sales | $ 590,922 | $ 507,664 | $ 479,382 | $ 445,110 | $ 562,625 | $ 494,810 | $ 493,222 | $ 487,646 | $ 2,023,078 | $ 2,038,303 | $ 2,001,240
Interest expense, net | (6,585) | (5,912) | (5,793) | (6,461) | (7,289) | (5,858) | (5,108) | (5,822) | (24,751) | (24,077) | (22,533)
Consolidated earnings before income taxes | 80,756 | 63,408 | 54,366 | 27,956 | 68,727 | 57,559 | 57,591 | 57,072 | $ 226,486 | $ 240,949 | $ 227,244
Total of Reporting Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment earnings (loss) | 99,630 | 79,689 | 70,047 | 65,037 | 89,494 | 76,981 | 72,852 | 75,061 |  |  |
Aerospace [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales | 365,305 | 308,582 | 290,690 | 268,599 | 335,207 | 288,480 | 281,426 | 255,770 |  |  |
Segment earnings (loss) | 80,376 | 57,726 | 50,578 | 43,486 | 59,964 | 46,362 | 45,628 | 35,793 |  |  |
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales | 225,617 | 199,082 | 188,692 | 176,511 | 227,418 | 206,330 | 211,796 | 231,876 |  |  |
Segment earnings (loss) | 19,254 | 21,963 | 19,469 | 21,551 | 29,530 | 30,619 | 27,224 | 39,268 |  |  |
Unallocated Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment earnings (loss) | $ (12,289) | $ (10,369) | $ (9,888) | $ (30,620) | $ (13,478) | $ (13,564) | $ (10,153) | $ (12,167) |  |  |

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