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Schedule II-Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 03, 2020
Sep. 28, 2019
Sep. 29, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning of period $ 58,411    
End of period 65,298 $ 58,411  
Allowance for doubtful accounts [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning of period 597 385 $ 79
Charged to Costs and Expenses 371 212 383
Other Additions 0 0 0
Other Deductions [1] 0 0 (77)
End of period 968 597 385
Inventory reserve [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning of period 29,313 26,889 24,639
Charged to Costs and Expenses 4,170 2,657 4,897
Other Additions 0 0 0
Other Deductions [2] (2,320) (233) (2,647)
End of period 31,163 29,313 26,889
Valuation allowance for deferred taxes [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning of period 58,411 37,249 29,614
Charged to Costs and Expenses [3] 6,887 0 0
Other Additions 0 21,162 7,635
Other Deductions 0 0 0
End of period $ 65,298 $ 58,411 $ 37,249
[1] Represents write-offs of specific accounts receivable.
[2] Sale or scrap of previously reserved inventory.
[3] Reflects increase/decrease in the valuation allowance primarily associated with the Company's U.S. and foreign net operating losses and other deferred tax assets.