Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Income Taxes
Tax benefit related to reduction in the amount of undistributed earnings expected to be repatriated to the US in the foreseeable future		$ 3,326
Income tax expense reduction due to research and experimentation tax credit	6,847
Estimated decrease in liability for unrecognized tax benefits	2,206
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 17,374		$ 15,061

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to research tax credits generated or utilized under enacted tax laws during the period.

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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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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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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