Commitments And Contingencies (Schedule Of Future Purchase Requirements) (Details) (USD $)	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Commitments And Contingencies
2012	$ 8,738,000
2013	7,698,000
2014	6,760,000
2015	6,512,000
2016	6,111,000
Thereafter	31,643,000
Future purchase requirements, total	67,462,000
Actual purchases made under contracts with minimum requirements	$ 11,100,000	$ 16,900,000	$ 18,300,000

Actual purchases made under contracts with minimum requirements.

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- Definition

The carrying amount of the long-term purchase obligation as of the balance sheet date, which equals the sum of all payments due.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 6

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 10

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

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-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

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- Definition

The aggregate remaining amount of payments due after the fifth year after the balance sheet date to extinguish a recorded unconditional purchase obligation.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 10

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308

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The aggregate amount of payments due in the fifth year after the balance sheet date to reduce a recorded unconditional purchase obligation.

+ References

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The aggregate amount of payments due in the fourth year after the balance sheet date to reduce a recorded unconditional purchase obligation.

+ References

+ Details

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- Definition

The aggregate amount of payments due in the second year after the balance sheet date to reduce a recorded unconditional purchase obligation.

+ References

+ Details

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The aggregate amount of payments due in the third year after the balance sheet date to reduce a recorded unconditional purchase obligation.

+ References

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- Definition

The aggregate amount of payments due in the first year after the balance sheet date to reduce a recorded unconditional purchase obligation.

+ References

+ Details

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