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Segment Information (Consolidated Net Sales and Earnings by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Net sales	$ 558,365	$ 483,759	$ 485,513	$ 408,339	$ 528,697	$ 460,241	$ 468,793	$ 407,896	$ 1,935,976	$ 1,865,627	$ 1,711,702
Segment earnings (loss)									265,062	256,633	243,374
Interest expense, net	(6,439)	(6,655)	(6,948)	(6,388)	(6,465)	(6,346)	(6,468)	(6,182)	(26,430)	(25,461)	(24,865)
Consolidated earnings before income taxes	75,201	35,497	50,336	38,537	65,885	37,708	54,038	40,176	199,571	197,807	187,567
Total of Reporting Segments [Member]
Net sales	558,365	483,759	485,513	408,339	528,697	460,241	468,793	407,896
Segment earnings (loss)	92,749	51,379	65,458	55,476	82,092	52,741	68,015	53,785
Aerospace [Member]
Net sales	307,377	272,218	270,493	211,389	264,046	214,474	224,337	193,226	1,061,477	896,083	843,032
Segment earnings (loss)	54,382	38,949	41,223	31,568	47,915	21,536	33,681	27,060	166,122	130,192	129,502
Energy [Member]
Net sales	250,988	211,541	215,020	196,950	264,651	245,767	244,456	214,670	874,499	969,544	868,670
Segment earnings (loss)	38,367	12,430	24,235	23,908	34,177	31,205	34,334	26,725	98,940	126,441	113,872
Unallocated Corporate [Member]
Segment earnings (loss)	$ (11,109)	$ (9,227)	$ (8,174)	$ (10,551)	$ (9,742)	$ (8,687)	$ (7,509)	$ (7,427)	$ (39,061)	$ (33,365)	$ (30,942)

X

- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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