Intangible Assets (Details) (USD $)	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2011
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	$ 316,851,000		$ 323,215,000
Accumulated Amortization	158,050,000		158,994,000
Amortization expense related to intangible assets	5,500,000	5,500,000
CCP Contracts
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives, minimum (in years)	8
Estimated useful lives, maximum (in years)	20
Gross Carrying Amount	117,690,000		117,690,000
Accumulated Amortization	60,326,000		58,643,000
Customer Relationships
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives, minimum (in years)	5
Estimated useful lives, maximum (in years)	15
Gross Carrying Amount	72,464,000		77,914,000
Accumulated Amortization	34,488,000		38,454,000
Trade Names
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives, minimum (in years)	5
Estimated useful lives, maximum (in years)	20
Gross Carrying Amount	67,890,000		67,890,000
Accumulated Amortization	24,483,000		23,608,000
Patents And Patented Technologies
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives, minimum (in years)	4
Estimated useful lives, maximum (in years)	19
Gross Carrying Amount	54,822,000		54,736,000
Accumulated Amortization	37,629,000		36,296,000
Other Intangible Assets
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives, minimum (in years)	2
Estimated useful lives, maximum (in years)	17
Gross Carrying Amount	3,985,000		4,985,000
Accumulated Amortization	$ 1,124,000		$ 1,993,000