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Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2012	Mar. 31, 2012	Mar. 31, 2011	Sep. 30, 2011
Income Taxes
Tax benefit related to reduction in the amount of undistributed earnings expected to be repatriated to the US in the foreseeabel future	$ 3,326
Income tax expense reduction due to research and experimentation tax credit			1,890
Reduction in liability for unrecognized tax benefits		1,122
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 15,322	$ 15,322		$ 14,078

Reflects the effects of adjustments of previously recorded tax expense, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, IRS tax settlement and unusual repatriation of foreign earnings.

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