Long-Lived Assets (Details 2) (USD $)	12 Months Ended
	Sep. 30, 2013 item	Sep. 30, 2012	Sep. 30, 2011
Long-Lived Assets
Number of indefinite lived intangible assets not being amortized	1
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	$ 321,613,000	$ 305,616,000
Accumulated Amortization	181,816,000	161,705,000
Amortization expense related to intangible assets	20,200,000	20,700,000	22,400,000
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
Accumulated Amortization	58,699,000	53,379,000
Customer Relationships
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	83,564,000	72,464,000
Accumulated Amortization	44,129,000	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	67,790,000	67,890,000
Accumulated Amortization	30,502,000	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	55,099,000	55,102,000
Accumulated Amortization	46,954,000	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	3,960,000	3,760,000
Accumulated Amortization	1,532,000	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
Trade name
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	$ 4,800,000	$ 0