Long-Lived Assets (Details 3) (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	$ 305,616,000	$ 323,215,000
Accumulated Amortization	161,705,000	158,994,000
Amortization expense related to intangible assets	20,700,000	22,400,000	22,200,000
CCP Contracts
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	106,400,000	117,690,000
Accumulated Amortization	53,379,000	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	77,914,000
Accumulated Amortization	38,382,000	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
Accumulated Amortization	27,105,000	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	55,102,000	54,736,000
Accumulated Amortization	41,661,000	36,296,000
Patents And Patented Technologies | Minimum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives	4 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	4,985,000
Accumulated Amortization	$ 1,178,000	$ 1,993,000
Other Intangible Assets | Minimum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives	3 years
Other Intangible Assets | Maximum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives	17 years