Income Taxes (Details) (USD $)	3 Months Ended	9 Months Ended
Jul. 01, 2011	Jul. 02, 2010	Jul. 01, 2011	Jul. 02, 2010
Tax provisions	$ 20,211,000	$ 17,933,000	$ 53,604,000	$ 39,829,000
Federal statutory rate	35.00%	35.00%	35.00%	35.00%
Federal research and development tax credits			4,800,000
Change in gross unrecognized tax benefits			2,800,000
Gross unrecognized tax benefits	26,600,000		26,600,000
Unrecognized tax benefits that would impact the effective tax rate, if recognized	17,800,000		17,800,000
Preliminary valuation allowance related to acquisition			15,700,000
Interest related to unrecognized tax benefits	200,000
United States [Member]
Tax provisions	17,600,000	17,600,000	49,200,000	39,000,000
Valuation allowance related to deferred tax assets	24,000,000		24,000,000
Need to generate future taxable income to utilize all of its deferred tax assets	153,000,000		153,000,000
Foreign Country [Member]
Tax provisions	2,600,000	300,000	4,400,000	800,000
Valuation allowance related to deferred tax assets	$ 1,600,000		$ 1,600,000

Deferred taxes business combination valuation to potentially reduce income tax expense.

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Federal research and development tax credits.

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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The sum of the portions of deferred tax assets as of the balance sheet date for which, based on the weight of available evidence, it is more likely than not will not be realized through future reductions of tax-based income.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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The net amount of all increases and decreases in unrecognized tax benefits for the period.

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

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