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Defined Benefit Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 2,262 $ 2,077 $ 872
Interest cost 1,230 1,086 97
Expected return on plan assets (787) (736) 0
Recognized net actuarial (gain) loss 240 (236) 993
Foreign exchange impacts (56) (6) 127
Recognition of curtailment (gain) due to plan freeze (1,236) 0 0
Net periodic pension cost 1,653 2,185 2,089
Change in benefit obligation:      
Benefit Obligation beginning balance [1] 52,547 8,621  
Business combinations and acquisitions 0 46,361  
Service cost 2,262 2,077 872
Interest cost 1,230 1,086 97
Actuarial gains 0 (141)  
Assumption change (1,517) (3,597)  
Experience (gain) loss 596 (1,502)  
Foreign exchange rate impacts (460) 1,685  
Benefits paid - total (1,923) (2,043)  
Recognition of curtailment (gain) due to plan freeze (1,236) 0 0
Benefit Obligation ending balance 51,499 52,547 [1] 8,621 [1]
Projected benefit obligation at end of year: 51,499 52,547  
Change in plan assets:      
Fair value of plan assets, beginning balance 11,856 0  
Business combinations and acquisitions 0 11,121  
Actual return on plan assets 672 1,092  
Employer contributions 361 0  
Benefits paid - funded plan (403) (357)  
Fair value of plan assets, ending balance 12,486 11,856 $ 0
Unfunded status at end of year (39,013) (40,691)  
Accrued benefit liability - current (1,485) (1,238)  
Accrued benefit liability - non current (37,528) (39,454)  
Accumulated other comprehensive gain (pre-tax) (6,340) (5,360)  
Accumulated benefit obligation 47,713 $ 47,798  
2019 2,044    
2020 1,864    
2021 2,169    
2022 3,013    
2023 2,433    
2024-2028 15,477    
Total future defined benefit plan expense $ 27,000    
Percentage allocation of assets for Plan Benefits, Defined Benefit Plan 100.00%    
Defined Benefit Plan, Actual Plan Asset Allocations 100.00% 100.00%  
(Level 1)      
Change in plan assets:      
Fair value of plan assets, beginning balance $ 0    
Fair value of plan assets, ending balance 0 $ 0  
(Level 2)      
Change in plan assets:      
Fair value of plan assets, beginning balance 11,856    
Fair value of plan assets, ending balance 12,486 11,856  
(Level 3)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
Small cap      
Change in plan assets:      
Fair value of plan assets, beginning balance 304    
Fair value of plan assets, ending balance 297 304  
Small cap | (Level 1)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
Small cap | (Level 2)      
Change in plan assets:      
Fair value of plan assets, beginning balance 304    
Fair value of plan assets, ending balance 297 304  
Small cap | (Level 3)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
Mid cap      
Change in plan assets:      
Fair value of plan assets, beginning balance 621    
Fair value of plan assets, ending balance 593 621  
Mid cap | (Level 1)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
Mid cap | (Level 2)      
Change in plan assets:      
Fair value of plan assets, beginning balance 621    
Fair value of plan assets, ending balance 593 621  
Mid cap | (Level 3)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
Large cap      
Change in plan assets:      
Fair value of plan assets, beginning balance 2,382    
Fair value of plan assets, ending balance 2,368 2,382  
Large cap | (Level 1)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
Large cap | (Level 2)      
Change in plan assets:      
Fair value of plan assets, beginning balance 2,382    
Fair value of plan assets, ending balance 2,368 2,382  
Large cap | (Level 3)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
Total market stock      
Change in plan assets:      
Fair value of plan assets, beginning balance 1,106    
Fair value of plan assets, ending balance 1,067 1,106  
Total market stock | (Level 1)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
Total market stock | (Level 2)      
Change in plan assets:      
Fair value of plan assets, beginning balance 1,106    
Fair value of plan assets, ending balance 1,067 1,106  
Total market stock | (Level 3)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
International      
Change in plan assets:      
Fair value of plan assets, beginning balance 1,897    
Fair value of plan assets, ending balance 1,762 1,897  
International | (Level 1)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
International | (Level 2)      
Change in plan assets:      
Fair value of plan assets, beginning balance 1,897    
Fair value of plan assets, ending balance 1,762 1,897  
International | (Level 3)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
Emerging markets      
Change in plan assets:      
Fair value of plan assets, beginning balance 342    
Fair value of plan assets, ending balance 263 342  
Emerging markets | (Level 1)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
Emerging markets | (Level 2)      
Change in plan assets:      
Fair value of plan assets, beginning balance 342    
Fair value of plan assets, ending balance 263 342  
Emerging markets | (Level 3)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
Bonds and mortgages      
Change in plan assets:      
Fair value of plan assets, beginning balance 4,031    
Fair value of plan assets, ending balance 4,229 4,031  
Bonds and mortgages | (Level 1)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
Bonds and mortgages | (Level 2)      
Change in plan assets:      
Fair value of plan assets, beginning balance 4,031    
Fair value of plan assets, ending balance 4,229 4,031  
Bonds and mortgages | (Level 3)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
Inflation protected      
Change in plan assets:      
Fair value of plan assets, beginning balance 555    
Fair value of plan assets, ending balance 593 555  
Inflation protected | (Level 1)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
Inflation protected | (Level 2)      
Change in plan assets:      
Fair value of plan assets, beginning balance 555    
Fair value of plan assets, ending balance 593 555  
Inflation protected | (Level 3)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
High yield      
Change in plan assets:      
Fair value of plan assets, beginning balance 618    
Fair value of plan assets, ending balance 606 618  
High yield | (Level 1)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 0  
High yield | (Level 2)      
Change in plan assets:      
Fair value of plan assets, beginning balance 618    
Fair value of plan assets, ending balance 606 618  
High yield | (Level 3)      
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance 0 $ 0  
Money market      
Change in plan assets:      
Fair value of plan assets, ending balance 708    
Money market | (Level 1)      
Change in plan assets:      
Fair value of plan assets, ending balance 0    
Money market | (Level 2)      
Change in plan assets:      
Fair value of plan assets, ending balance 708    
Money market | (Level 3)      
Change in plan assets:      
Fair value of plan assets, ending balance $ 0    
Equity securities      
Change in plan assets:      
Percentage allocation of assets for Plan Benefits, Defined Benefit Plan 50.00%    
Defined Benefit Plan, Actual Plan Asset Allocations 51.00% 56.00%  
Debt securities      
Change in plan assets:      
Percentage allocation of assets for Plan Benefits, Defined Benefit Plan 50.00%    
Defined Benefit Plan, Actual Plan Asset Allocations 49.00% 44.00%  
United States      
Change in plan assets:      
Discount rate: 4.17% 3.60%  
Expected return on plan assets: 6.75% 6.60%  
Rate of compensation increase 0.00% 3.00%  
Foreign Countries      
Change in plan assets:      
Discount rate: 1.90% 1.70%  
Rate of compensation increase 1.50% 2.00%  
United States      
Change in benefit obligation:      
Projected benefit obligation at end of year: $ 15,754 $ 17,543  
Change in plan assets:      
Fair value of plan assets, beginning balance 11,856    
Fair value of plan assets, ending balance 12,323 11,856  
Foreign Countries      
Change in benefit obligation:      
Projected benefit obligation at end of year: 35,745 35,004  
Change in plan assets:      
Fair value of plan assets, beginning balance 0    
Fair value of plan assets, ending balance $ 163 $ 0  
[1] (1) The beginning of the year balances in fiscal 2017 relate to plans held in South Korea, Japan, Italy and Germany. These were not disclosed in prior years as the net liability was not material.