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Valuation And Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 27, 2013
Sep. 28, 2012
Sep. 30, 2011
Allowance For Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 4,172 $ 3,076 $ 2,987
Additions Charged to Costs and Expenses 769 1,558 448
Less Deductions 1,182 462 359
Balance at End of Year 3,759 4,172 3,076
Reserves For Inventory Valuation [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 5,679 6,405 4,851
Additions Charged to Costs and Expenses 1,269 2,307 3,317
Less Deductions 2,933 3,033 1,763
Balance at End of Year 4,015 5,679 6,405
Valuation Of Deferred Tax Assets [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 13,299 14,300 39,178
Additions Charged to Costs and Expenses 1,262 1,461 2,915
Less Deductions 5,082 2,462 27,793
Balance at End of Year 9,479 13,299 14,300
Reserves For Sales Returns [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 1,367 1,484 1,181
Additions Charged to Costs and Expenses 1,857 1,995 2,462
Less Deductions 2,095 2,112 2,159
Balance at End of Year $ 1,129 $ 1,367 $ 1,484