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Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Sep. 30, 2013
Income Taxes
Income tax expense reduction due to research and experimentation tax credit		$ 6,847
Estimated decrease in liability for unrecognized tax benefits	379
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	13,705		17,838
Accrued interest and penalties	1,542		2,066
Unrecognized Tax Benefits	16,465		22,694
Net favorable amount as a result of resolutions and lapses of statutes of limitations	$ 5,573

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.

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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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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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

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