Intangible Assets (Details) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Sep. 30, 2011
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	$ 305,601,000		$ 305,601,000		$ 323,215,000
Accumulated Amortization	156,769,000		156,769,000		158,994,000
Amortization expense related to intangible assets	4,900,000	5,700,000	15,700,000	16,800,000
CCP Contracts
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	106,400,000		106,400,000		117,690,000
Accumulated Amortization	52,049,000		52,049,000		58,643,000
CCP Contracts | Minimum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			8 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	72,464,000		72,464,000		77,914,000
Accumulated Amortization	37,084,000		37,084,000		38,454,000
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			15 years
Trade Names
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	67,890,000		67,890,000		67,890,000
Accumulated Amortization	26,231,000		26,231,000		23,608,000
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	55,087,000		55,087,000		54,736,000
Accumulated Amortization	40,314,000		40,314,000		36,296,000
Patents And Patented Technologies | Minimum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			2 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	3,760,000		3,760,000		4,985,000
Accumulated Amortization	$ 1,091,000		$ 1,091,000		$ 1,993,000
Other Intangible Assets | Minimum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			2 years
Other Intangible Assets | Maximum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			17 years