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Schedule II-Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning of period $ 27,381    
End of period 29,614 $ 27,381  
Allowance for doubtful accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning of period 506 621 $ 143
Charged to Costs and Expenses (136) (115) 478
Other Additions 0 0 0
Other Deductions [1] (291) 0 0
End of period 79 506 621
Inventory reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning of period 21,080 19,073 13,863
Charged to Costs and Expenses 10,925 6,676 3,978
Other Additions 0 0 7,696
Other Deductions [2] (7,366) (4,669) (6,464)
End of period 24,639 21,080 19,073
Valuation allowance for deferred taxes [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning of period 27,381 23,128 24,624
Charged to Costs and Expenses [3] 0 563 0
Other Additions 2,233 3,690 0
Other Deductions 0 0 (1,496)
End of period $ 29,614 $ 27,381 $ 23,128
[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.