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Commitments and Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]
Total rental expense	$ 1.3	$ 1.4	$ 1.4
Amount of purchase orders that had been entered into wafer work-in-process	$ 28.9

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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