Intangible Assets (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011	Sep. 30, 2011
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	$ 305,591,000		$ 305,591,000		$ 323,215,000
Accumulated Amortization	151,833,000		151,833,000		158,994,000
Amortization expense related to intangible assets	5,300,000	5,600,000	10,800,000	11,200,000
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	106,400,000		106,400,000		117,690,000
Accumulated Amortization	50,719,000		50,719,000		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		72,464,000		77,914,000
Accumulated Amortization	35,786,000		35,786,000		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		67,890,000
Accumulated Amortization	25,357,000		25,357,000		23,608,000
Patents And Patented Technologies
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives, minimum (in years)			2
Estimated useful lives, maximum (in years)			19
Gross Carrying Amount	55,077,000		55,077,000		54,736,000
Accumulated Amortization	38,966,000		38,966,000		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	3,760,000		3,760,000		4,985,000
Accumulated Amortization	$ 1,005,000		$ 1,005,000		$ 1,993,000