Intangible Assets (Intangible Assets by Major Class) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 154,644	$ 85,769
Accumulated amortization	(48,749)	(30,590)
Net carrying amount	105,895	55,179
Trade Name And Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	3,125	2,926
Accumulated amortization	(878)	(457)
Net carrying amount	2,247	2,469
Technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	25,396	24,848
Accumulated amortization	(18,093)	(13,117)
Net carrying amount	7,303	11,731
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	126,123	57,995
Accumulated amortization	(29,778)	(17,016)
Net carrying amount	$ 96,345	$ 40,979