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Valuation And Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Oct. 01, 2010
Allowance For Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 3,076 $ 2,987 $ 2,695
Additions Charged to Costs and Expenses 1,558 448 995
Less Deductions 462 359 703
Balance at End of Year 4,172 3,076 2,987
Reserves For Inventory Valuation [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 6,405 4,851 6,252
Additions Charged to Costs and Expenses 2,307 3,317 1,404
Less Deductions 3,033 1,763 2,805
Balance at End of Year 5,679 6,405 4,851
Valuation Of Deferred Tax Assets [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 14,300 39,178 40,883
Additions Charged to Costs and Expenses 1,461 2,915 3,882
Less Deductions 2,462 27,793 5,587
Balance at End of Year 13,299 14,300 39,178
Reserves For Sales Returns [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 1,484 1,181 1,265
Additions Charged to Costs and Expenses 1,995 2,462 1,731
Less Deductions 2,112 2,159 1,815
Balance at End of Year $ 1,367 $ 1,484 $ 1,181