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VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 29, 2017
Sep. 30, 2016
Oct. 02, 2015
Allowance for doubtful accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 2,182 $ 2,329 $ 2,665
Additions Charged to Costs and Expenses 876 299 292
Less Deductions 827 446 628
Balance at End of Year 2,231 2,182 2,329
Reserves for inventory valuation      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 5,623 4,879 3,950
Additions Charged to Costs and Expenses 1,356 3,650 2,123
Less Deductions 1,551 2,906 1,194
Balance at End of Year 5,428 5,623 4,879
Valuation of deferred tax assets      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 10,215 9,786 8,734
Additions Charged to Costs and Expenses 603 1,670 2,602
Less Deductions 2,094 1,241 1,550
Balance at End of Year 8,724 10,215 9,786
Reserves for sales returns      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 2,772 1,945 1,428
Additions Charged to Costs and Expenses 2,346 4,596 3,139
Less Deductions 3,188 3,769 2,622
Balance at End of Year $ 1,930 $ 2,772 $ 1,945