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Capital Assets (Intangible Assets) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Mar. 30, 2019
Sep. 29, 2018
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets $ 350,533 $ 301,217
Accumulated Amortization (63,432) (55,079)
Intangible assets, net $ 287,101 $ 246,138
Weighted Average Useful Life (in Years) 14 years 6 months 14 years 10 months
Software development costs    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 35,297 $ 31,251
Accumulated Amortization (15,859) (15,860)
Net Carrying Value $ 19,438 $ 15,391
Weighted Average Useful Life (in Years) 6 years 4 months 6 years 5 months 15 days
Technology and patents    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 59,055 $ 46,405
Accumulated Amortization (14,110) (12,188)
Net Carrying Value $ 44,945 $ 34,217
Weighted Average Useful Life (in Years) 14 years 10 months 24 days 14 years 10 months 24 days
Trademarks and trade names    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 12,697 $ 6,754
Accumulated Amortization (3,442) (2,987)
Net Carrying Value $ 9,255 $ 3,767
Weighted Average Useful Life (in Years) 20 years 7 months 25 days 25 years 5 months
Customer lists    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 179,919 $ 156,971
Accumulated Amortization (28,831) (23,314)
Net Carrying Value $ 151,088 $ 133,657
Weighted Average Useful Life (in Years) 15 years 8 months 15 years 9 months 18 days
Land-use rights    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 2,360 $ 2,336
Accumulated Amortization (858) (730)
Net Carrying Value $ 1,502 $ 1,606
Weighted Average Useful Life (in Years) 26 years 2 months 26 years
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 3,705  
Accumulated Amortization (332)  
Net Carrying Value $ 3,373  
Weighted Average Useful Life (in Years) 4 years  
Software Development Not Yet Placed In Service    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 19,438 $ 15,391
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets $ 57,500 $ 57,500