Income Taxes (Narrative) (Details) (USD $)	3 Months Ended
Jan. 03, 2015	Dec. 28, 2013	Sep. 30, 2014
Income Tax Disclosure [Line Items]
Effective income tax rate	12.00%	25.00%
Income before income taxes	$ 34,407,000	$ 53,118,000
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	4,000,000
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	2,100,000
Unrecognized tax benefits	14,800,000us-gaap_UnrecognizedTaxBenefits		15,000,000us-gaap_UnrecognizedTaxBenefits
Income tax provision upon recognition of unrecognized tax benefit	13,500,000
Unrecognized tax benefits that would impact valuation allowance	4,700,000
Potentail reduction in unrecognized tax benefits and accrued interest over next 12 months	(8,000,000)
Adjustments to additional paid in capital, income tax benefit from share-based compensation		$ 6,800,000

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Unrecognized Tax Benefits that Would Impact Effective Tax Rate, Resulting Change in Valuation Allowance

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- Definition

Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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-Name Accounting Standards Codification

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-Subparagraph (SX 210.3-04)

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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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 other adjustments.

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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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- Definition

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

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