Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2015
Gross carrying amount and accumulated amortization of intangible assets
Total Gross Carrying Amount	$ 349,600		$ 349,600		$ 322,749
Accumulated Amortization	187,838		187,838		179,031
Amortization expense related to intangible assets	4,800	$ 4,600	9,400	$ 9,000
Trade names
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	22,135		22,135		15,300
Intellectual property
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	10,650		10,650
CCP Contracts
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	112,300		112,300		112,300
Accumulated Amortization	72,717		72,717		69,875
Customer Relationships
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	117,849		117,849		109,078
Accumulated Amortization	61,955		61,955		57,844
Trade names
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	66,960		66,960		66,960
Accumulated Amortization	38,245		38,245		36,554
Patents and Patented Technologies
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	15,021		15,021		14,526
Accumulated Amortization	12,515		12,515		12,574
Other
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	4,685		4,685		4,585
Accumulated Amortization	$ 2,406		$ 2,406		$ 2,184
Minimum | CCP Contracts
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			15 years
Minimum | Customer Relationships
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			5 years
Minimum | Trade names
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			5 years
Minimum | Patents and Patented Technologies
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			5 years
Minimum | Other
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			5 years
Maximum | CCP Contracts
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			20 years
Maximum | Customer Relationships
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			17 years
Maximum | Trade names
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			20 years
Maximum | Patents and Patented Technologies
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			19 years
Maximum | Other
Gross carrying amount and accumulated amortization of intangible assets
Estimated useful lives			17 years