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Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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