Segment Information (Consolidated Net Sales and Earnings by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Net sales	$ 493,222us-gaap_SalesRevenueNet	$ 482,467us-gaap_SalesRevenueNet	$ 980,868us-gaap_SalesRevenueNet	$ 911,509us-gaap_SalesRevenueNet
Interest expense, net	(5,108)us-gaap_InterestRevenueExpenseNet	(6,128)us-gaap_InterestRevenueExpenseNet	(10,930)us-gaap_InterestRevenueExpenseNet	(12,131)us-gaap_InterestRevenueExpenseNet
Consolidated earnings before income taxes	57,591	56,756	114,663	89,700
Total of Reporting Segments [Member]
Net sales	493,222	482,467	980,868	911,509
Segment earnings (loss)	72,852	72,177	147,913	121,797
Aerospace [Member]
Net sales	281,426	261,021	537,196	490,893
Segment earnings (loss)	45,628	40,289	81,421	62,838
Energy [Member]
Net sales	211,796	221,446	443,672	420,616
Segment earnings (loss)	27,224	31,888	66,492	58,959
Unallocated Corporate [Member]
Segment earnings (loss)	$ (10,153)	$ (9,293)	$ (22,320)	$ (19,966)

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

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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Amount of interest revenue (income derived from investments in debt securities and on cash and cash equivalents) net of interest expense (cost of borrowed funds accounted for as interest).

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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

-Section 03

-Paragraph 1

-Article 5

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