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VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 28, 2018 | Sep. 29, 2017 | Sep. 30, 2016
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | $ 2,231 | $ 2,182 | $ 2,329
Additions Charged to Costs and Expenses | 21 | 876 | 299
Less Deductions | 615 | 827 | 446
Balance at End of Year | 1,637 | 2,231 | 2,182
Reserves for inventory valuation |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 5,428 | 5,623 | 4,879
Additions Charged to Costs and Expenses | 394 | 1,356 | 3,650
Less Deductions | 698 | 1,551 | 2,906
Balance at End of Year | 5,124 | 5,428 | 5,623
Valuation of deferred tax assets |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 8,724 | 10,215 | 9,786
Additions Charged to Costs and Expenses | 1,148 | 603 | 1,670
Less Deductions | 3,470 | 2,094 | 1,241
Balance at End of Year | 6,402 | 8,724 | 10,215
Reserves for sales returns |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 1,930 | 2,772 | 1,945
Additions Charged to Costs and Expenses | 3,927 | 2,346 | 4,596
Less Deductions | 4,325 | 3,188 | 3,769
Balance at End of Year | $ 1,532 | $ 1,930 | $ 2,772

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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