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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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No definition available.

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Intangible Assets (Details) (USD $)	3 Months Ended		6 Months Ended
Intangible Assets (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014
Gross carrying amount and accumulated amortization of intangible assets
Total Gross Carrying Amount	$ 323,229,000		$ 323,229,000		$ 321,234,000
Accumulated Amortization	170,417,000		170,417,000		161,371,000
Amortization expense related to intangible assets	4,600,000us-gaap_AmortizationOfIntangibleAssets	5,500,000us-gaap_AmortizationOfIntangibleAssets	9,000,000us-gaap_AmortizationOfIntangibleAssets	10,600,000us-gaap_AmortizationOfIntangibleAssets
CCP Contracts
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	112,300,000		112,300,000		112,300,000
Accumulated Amortization	67,033,000		67,033,000		64,192,000
CCP Contracts \| Minimum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			15 years
CCP Contracts \| Maximum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			20 years
Customer Relationships
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	109,299,000		109,299,000		107,953,000
Accumulated Amortization	54,188,000		54,188,000		50,355,000
Customer Relationships \| Minimum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			5 years
Customer Relationships \| Maximum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			17 years
Trade Names
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	67,220,000		67,220,000		67,220,000
Accumulated Amortization	35,104,000		35,104,000		33,394,000
Trade Names \| Minimum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			5 years
Trade Names \| Maximum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			20 years
Patents and Patented Technologies
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	14,526,000		14,526,000		14,526,000
Accumulated Amortization	12,130,000		12,130,000		11,686,000
Patents and Patented Technologies \| Minimum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			5 years
Patents and Patented Technologies \| Maximum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			19 years
Other Intangible Assets
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	4,584,000		4,584,000		3,935,000
Accumulated Amortization	1,962,000		1,962,000		1,744,000
Other Intangible Assets \| Minimum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			5 years
Other Intangible Assets \| Maximum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			17 years
Trade Names
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	$ 15,300,000		$ 15,300,000		$ 15,300,000