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Segment Information (Consolidated Net Sales and Earnings by Segment) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2012 | Mar. 31, 2011
Net sales | $ 468,793 | $ 418,866 | $ 876,689 | $ 783,941
Interest expense, net | (6,468) | (6,214) | (12,650) | (12,592)
Consolidated earnings before income taxes | 54,038 | 46,487 | 94,214 | 77,962
Total of Reporting Segments [Member] |  |  |  |
Segment earnings (loss) | 68,015 | 60,182 | 121,800 | 104,599
Aerospace [Member] |  |  |  |
Net sales | 224,337 | 204,945 | 417,563 | 386,089
Segment earnings (loss) | 33,681 | 33,241 | 60,741 | 53,155
Energy [Member] |  |  |  |
Net sales | 244,456 | 213,921 | 459,126 | 397,852
Segment earnings (loss) | 34,334 | 26,941 | 61,059 | 51,444
Unallocated Corporate [Member] |  |  |  |
Segment earnings (loss) | $ (7,509) | $ (7,481) | $ (14,936) | $ (14,045)

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