Intangible Assets (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Sep. 30, 2013
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	$ 350,748,000		$ 350,748,000		$ 321,613,000
Accumulated Amortization	192,217,000		192,217,000		181,816,000
Amortization expense related to intangible assets	5,500,000	5,300,000	10,600,000	10,200,000
CCP contracts
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	110,590,000		110,590,000		106,400,000
Accumulated Amortization	61,391,000		61,391,000		58,699,000
CCP contracts | Minimum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			15 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	102,164,000		102,164,000		83,564,000
Accumulated Amortization	47,456,000		47,456,000		44,129,000
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		67,790,000		67,790,000
Accumulated Amortization	32,240,000		32,240,000		30,502,000
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	54,869,000		54,869,000		55,099,000
Accumulated Amortization	49,561,000		49,561,000		46,954,000
Patents And patented technologies | Minimum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			6 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	3,935,000		3,935,000		3,960,000
Accumulated Amortization	1,569,000		1,569,000		1,532,000
Other Intangible Assets | Minimum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			6 years
Other Intangible Assets | Maximum
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			17 years
Trade names
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	$ 11,400,000		$ 11,400,000		$ 4,800,000