Intangible Assets - Gross Carrying Amounts and Accumulated Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015
Gross carrying amount and accumulated amortization of intangible assets
Total Gross Carrying Amount	$ 375,500		$ 375,500		$ 322,749
Accumulated Amortization	192,867		192,867		179,031
Amortization expense related to intangible assets	5,000	$ 4,600	14,400	$ 13,600
Trade names
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	27,785		27,785		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	129,670		129,670		112,300
Accumulated Amortization	74,391		74,391		69,875
Customer relationships
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	120,729		120,729		109,078
Accumulated Amortization	64,129		64,129		57,844
Trade names
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	66,960		66,960		66,960
Accumulated Amortization	39,097		39,097		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	12,731		12,731		12,574
Other
Gross carrying amount and accumulated amortization of intangible assets
Gross Carrying Amount	4,685		4,685		4,585
Accumulated Amortization	$ 2,519		$ 2,519		$ 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