Intangible Assets (Tables)

6 Months Ended

Mar. 31, 2014

Intangible Assets

Schedule of gross carrying amounts and accumulated amortization of intangible assets

		September 30, 2013				March 31, 2014
(in thousands of dollars)	Estimated useful lives	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Trade names	Indefinite	$	4,800	—		$	11,400	—
CCP contracts	15 - 20 years	106,400		$	58,699	110,590		$	61,391
Customer relationships	5 - 15 years	83,564		44,129		102,164		47,456
Trade names	5 - 20 years	67,790		30,502		67,790		32,240
Patents and patented technologies	6 - 19 years	55,099		46,954		54,869		49,561
Other	6 - 17 years	3,960		1,532		3,935		1,569
		$	321,613	$	181,816	$	350,748	$	192,217

Schedule of total currently estimated annual amortization expense

Year ending September 30:	(in thousands)
2014	$	21,087
2015	17,305
2016	17,048
2017	16,169
2018	16,119
2019	15,092