Intangible Assets (Details) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	$ 326,638,000		$ 326,638,000		$ 305,616,000
Accumulated Amortization	177,248,000		177,248,000		161,705,000
Amortization expense related to intangible assets	5,300,000	4,900,000	15,500,000	15,700,000
CCP Contracts
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			20 years
Gross Carrying Amount	106,400,000		106,400,000		106,400,000
Accumulated Amortization	57,368,000		57,368,000		53,379,000
Customer Relationships
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	84,613,000		84,613,000		72,464,000
Accumulated Amortization	42,681,000		42,681,000		38,382,000
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	75,963,000		75,963,000		67,890,000
Accumulated Amortization	29,999,000		29,999,000		27,105,000
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	55,002,000		55,002,000		55,102,000
Accumulated Amortization	45,640,000		45,640,000		41,661,000
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	4,660,000		4,660,000		3,760,000
Accumulated Amortization	$ 1,560,000		$ 1,560,000		$ 1,178,000
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