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Restructuring Costs - Restructuring Accrual Activity (Details) - USD ($)
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Restructuring Reserve [Roll Forward]      
Accrual balance, beginning of period $ 0 $ 842,000 $ 0
Restructuring costs 0 0 7,034,000
Amounts utilized 0 (842,000) (6,192,000)
Accrual balance, end of period 0 0 842,000
Employee Termination and Severance Costs      
Restructuring Reserve [Roll Forward]      
Accrual balance, beginning of period 0 684,000 0
Restructuring costs 0 0 5,255,000
Amounts utilized 0 (684,000) (4,571,000)
Accrual balance, end of period 0 0 684,000
Lease Obligations and Other Exit Costs      
Restructuring Reserve [Roll Forward]      
Accrual balance, beginning of period 0 158,000 0
Restructuring costs 0 0 1,779,000
Amounts utilized 0 (158,000) (1,621,000)
Accrual balance, end of period $ 0 $ 0 $ 158,000