Acquisitions (Schedule Of Purchase Price) (Details) (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Business Acquisition [Line Items]
Net cash used to acquire MKS	$ 280,026	$ 2,721	$ 32,790
MKS Inc [Member]
Business Acquisition [Line Items]
Acquisition of MKS stock	280,397
Acquisition of MKS vested and unvested stock options	18,040
Total purchase price allocation	298,437
Less: MKS cash acquired	(33,193)
Total purchase price, net of cash acquired	265,244
Less: Purchase price related to PTC options issued for MKS unvested options	(91)
Net cash used to acquire MKS	$ 265,153