Business Combinations (Narrative) (Details) (USD $)			3 Months Ended		3 Months Ended	12 Months Ended
	Jun. 10, 2011	Apr. 27, 2011	Sep. 30, 2011 SiGe [Member]	Jun. 10, 2011 SiGe [Member]	Sep. 30, 2011 AATI [Member]	Sep. 30, 2011 AATI [Member]	Sep. 30, 2011 AATI [Member] Maximum [Member]	Sep. 30, 2011 AATI [Member] Minimum [Member]
Percentage of interest acquired		100.00%		100.00%
Aggregated purchase price		$ 28,800,000		$ 278,900,000
Fair value of contingent consideration		2,000,000		57,400,000
Business combination, contingent consideration arrangements, range of outcomes, value, high			65,000,000
Business combination, contingent consideration arrangements, range of outcomes, value, low			0
Amount contributed to net income by acquired entity			39,700,000
Goodwill	162,387,000
Potential payment for pending acquisition in cash and stock, price per share					6.13	6.13
Expected payment for business acquisitions							200,000,000	190,000,000
Expected cash to be received from pending acquisition							90,000,000	80,000,000
Stock consideration right to receive, share amount					0.08725	0.08725
Closing value of the stock consideration					$ 2.45
Merger consideration right to receive, initial calculated amount without interest					$ 3.68	$ 3.68
Conditional last reported sale price during the pre-closing measurement period, price per share						$ 21.00