Supplemental Quarterly Financial Data (Unaudited) (Quarterly Financial Information - Segment Reporting) (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
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)

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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- Definition

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).

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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