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Schedule II-Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning of period $ 29,614    
End of period 37,249 $ 29,614  
Allowance for doubtful accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning of period 79 506 $ 621
Charged to Costs and Expenses 383 (136) (115)
Other Additions 0 0 0
Other Deductions [1] (77) (291) 0
End of period 385 79 506
Inventory reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning of period 24,639 21,080 19,073
Charged to Costs and Expenses 4,897 10,925 6,676
Other Additions 0 0 0
Other Deductions [2] (2,647) (7,366) (4,669)
End of period 26,889 24,639 21,080
Valuation allowance for deferred taxes [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning of period 29,614 27,381 23,128
Charged to Costs and Expenses [3] 0 0 563
Other Additions 7,635 2,233 3,690
Other Deductions 0 0 0
End of period $ 37,249 $ 29,614 $ 27,381
[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.