Income Taxes Narrative (Details) (USD $)	3 Months Ended
	Dec. 30, 2011	Dec. 31, 2010
Operating Loss Carryforwards [Line Items]
Income Tax Expense (Benefit)	$ 17,536,000	$ 15,868,000
Current Federal Tax Expense (Benefit)	15,500,000	15,200,000
Current Foreign Tax Expense (Benefit)	2,000,000	700,000
Federal research and development tax credits		4,400,000
Valuation Allowance, Amount	39,400,000
Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Income Tax Expense	11,600,000
Deferred Tax Assets, Tax Credit Carryforwards	231,100,000
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	3,900,000
Unrecognized Tax Benefits	36,000,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	23,900,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	100,000
Foreign Country [Member]
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Amount	13,300,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Amount	$ 26,100,000