Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	3 Months Ended
Mar. 31, 2015	Mar. 31, 2015	Sep. 30, 2014
Income tax expense reduction due to research and experimentation tax credit	$ 5,063
Estimated decrease in liability for unrecognized tax benefits	198	198
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	13,567	13,567	12,807
Accrued interest and penalties	1,293	1,293	1,158
Unrecognized Tax Benefits	23,037us-gaap_UnrecognizedTaxBenefits	23,037us-gaap_UnrecognizedTaxBenefits	22,687us-gaap_UnrecognizedTaxBenefits
Valuation Allowance of Deferred Tax Assets [Member]
Reversal of valuation allowance		$ 3,348

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

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-Glossary Unrecognized Tax Benefit

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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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Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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