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Defined Benefit Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 2,077 $ 872
Interest cost 1,086 97
Expected return on plan assets (736) 0
Recognized net actuarial (gain) loss (236) 993
Foreign exchange impacts (6) 127
Net periodic pension cost 2,185 2,089
Change in benefit obligation:    
Benefit Obligation beginning balance [1] 8,621  
Business combinations and acquisitions 46,361  
Service cost 2,077 872
Interest cost 1,086 97
Actuarial gains (141)  
Assumption change (3,597)  
Experience gain (1,502)  
Foreign exchange rate impacts 1,685  
Benefits paid - total (2,043)  
Benefit Obligation ending balance 52,547 8,621 [1]
Projected benefit obligation at end of year: 52,547  
Change in plan assets:    
Fair value of plan assets, beginning balance 0  
Business combinations and acquisitions 11,121  
Actual return on plan assets 1,092  
Employer contributions 0  
Benefits paid - funded plan (357)  
Fair value of plan assets, ending balance 11,856 0
Unfunded status at end of year (40,691)  
Accrued benefit liability - current (1,238)  
Accrued benefit liability - non current (39,454) $ (8,123)
Accumulated other comprehensive gain (pre-tax) (5,360)  
Accumulated benefit obligation 47,798  
2018 1,708  
2019 1,593  
2020 1,755  
2021 2,296  
2022 3,319  
2023-2027 14,220  
Total future defined benefit plan expense 24,891  
(Level 1)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
(Level 2)    
Change in plan assets:    
Fair value of plan assets, ending balance 11,856  
(Level 3)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Bonds and mortgages    
Change in plan assets:    
Fair value of plan assets, ending balance 4,031  
Bonds and mortgages | (Level 1)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Bonds and mortgages | (Level 2)    
Change in plan assets:    
Fair value of plan assets, ending balance 4,031  
Bonds and mortgages | (Level 3)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Inflation protected    
Change in plan assets:    
Fair value of plan assets, ending balance 555  
Inflation protected | (Level 1)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Inflation protected | (Level 2)    
Change in plan assets:    
Fair value of plan assets, ending balance 555  
Inflation protected | (Level 3)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
High yield    
Change in plan assets:    
Fair value of plan assets, ending balance 618  
High yield | (Level 1)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
High yield | (Level 2)    
Change in plan assets:    
Fair value of plan assets, ending balance 618  
High yield | (Level 3)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Money market    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
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 0  
Money market | (Level 3)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Small cap    
Change in plan assets:    
Fair value of plan assets, ending balance 304  
Small cap | (Level 1)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Small cap | (Level 2)    
Change in plan assets:    
Fair value of plan assets, ending balance 304  
Small cap | (Level 3)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Mid cap    
Change in plan assets:    
Fair value of plan assets, ending balance 621  
Mid cap | (Level 1)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Mid cap | (Level 2)    
Change in plan assets:    
Fair value of plan assets, ending balance 621  
Mid cap | (Level 3)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Large cap    
Change in plan assets:    
Fair value of plan assets, ending balance 2,382  
Large cap | (Level 1)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Large cap | (Level 2)    
Change in plan assets:    
Fair value of plan assets, ending balance 2,382  
Large cap | (Level 3)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Total market stock    
Change in plan assets:    
Fair value of plan assets, ending balance 1,106  
Total market stock | (Level 1)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Total market stock | (Level 2)    
Change in plan assets:    
Fair value of plan assets, ending balance 1,106  
Total market stock | (Level 3)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
International    
Change in plan assets:    
Fair value of plan assets, ending balance 1,897  
International | (Level 1)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
International | (Level 2)    
Change in plan assets:    
Fair value of plan assets, ending balance 1,897  
International | (Level 3)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Emerging markets    
Change in plan assets:    
Fair value of plan assets, ending balance 342  
Emerging markets | (Level 1)    
Change in plan assets:    
Fair value of plan assets, ending balance 0  
Emerging markets | (Level 2)    
Change in plan assets:    
Fair value of plan assets, ending balance 342  
Emerging markets | (Level 3)    
Change in plan assets:    
Fair value of plan assets, ending balance $ 0  
Target Allocation    
Change in plan assets:    
Percentage allocation of assets for Plan Benefits, Defined Benefit Plan 100.00%  
Target Allocation | Debt securities    
Change in plan assets:    
Percentage allocation of assets for Plan Benefits, Defined Benefit Plan 50.00%  
Target Allocation | Debt securities    
Change in plan assets:    
Percentage allocation of assets for Plan Benefits, Defined Benefit Plan 50.00%  
Allocation    
Change in plan assets:    
Percentage allocation of assets for Plan Benefits, Defined Benefit Plan 100.00%  
Allocation | Debt securities    
Change in plan assets:    
Percentage allocation of assets for Plan Benefits, Defined Benefit Plan 56.00%  
Allocation | Debt securities    
Change in plan assets:    
Percentage allocation of assets for Plan Benefits, Defined Benefit Plan 44.00%  
United States    
Change in plan assets:    
Discount rate: 3.60%  
Expected return on plan assets: 6.60%  
Rate of compensation increase 3.00%  
Foreign Countries    
Change in plan assets:    
Discount rate: 1.70%  
Expected return on plan assets: 0.00%  
Rate of compensation increase 2.00%  
United States    
Change in benefit obligation:    
Projected benefit obligation at end of year: $ 17,543  
Change in plan assets:    
Fair value of plan assets, ending balance 11,856  
Foreign Countries    
Change in benefit obligation:    
Projected benefit obligation at end of year: 35,004  
Change in plan assets:    
Fair value of plan assets, ending balance $ 0  
[1] (1) The beginning of the year balances 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.