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VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 1,637 $ 2,231 $ 2,182
Additions Charged to Costs and Expenses 2,003 21 876
Less Deductions 1,090 615 827
Balance at End of Year 2,550 1,637 2,231
Reserves for inventory valuation      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 5,124 5,428 5,623
Additions Charged to Costs and Expenses 1,009 394 1,356
Less Deductions 910 698 1,551
Balance at End of Year 5,223 5,124 5,428
Valuation of deferred tax assets      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 6,402 8,724 10,215
Additions Charged to Costs and Expenses 430 1,148 603
Less Deductions 868 3,470 2,094
Balance at End of Year 5,964 6,402 8,724
Reserves for sales returns      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 1,532 1,930 2,772
Additions Charged to Costs and Expenses 7,040 3,927 2,346
Less Deductions 3,692 4,325 3,188
Balance at End of Year $ 4,880 $ 1,532 $ 1,930