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VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
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