Capital Assets (Intangible Assets) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 27, 2020	Sep. 28, 2019
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (89,158)	$ (72,059)
Weighted Average Useful Life (in Years)	14 years 1 month 6 days	14 years 4 months 24 days
Total intangible assets	$ 432,059	$ 378,644
Intangible assets, net	342,901	306,585
Trade names
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	57,500	57,500
Software development costs
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	49,666	39,546
Accumulated Amortization	(16,233)	(16,035)
Net Carrying Value	$ 33,433	$ 23,511
Weighted Average Useful Life (in Years)	5 years 8 months 12 days	6 years 2 months 12 days
Technology and patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 68,457	$ 63,015
Accumulated Amortization	(19,121)	(15,739)
Net Carrying Value	$ 49,336	$ 47,276
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	$ 28,923	$ 20,186
Accumulated Amortization	(4,928)	(3,808)
Net Carrying Value	$ 23,995	$ 16,378
Weighted Average Useful Life (in Years)	17 years 4 months 24 days	18 years 4 months 24 days
Customer lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 217,233	$ 192,488
Accumulated Amortization	(44,527)	(34,735)
Net Carrying Value	$ 172,706	$ 157,753
Weighted Average Useful Life (in Years)	15 years 7 months 6 days	15 years 7 months 6 days
Land-use rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,305	$ 2,303
Accumulated Amortization	(1,152)	(968)
Net Carrying Value	$ 1,153	$ 1,335
Weighted Average Useful Life (in Years)	25 years 8 months 12 days	25 years 8 months 12 days
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,975	$ 3,606
Accumulated Amortization	(3,197)	(774)
Net Carrying Value	$ 4,778	$ 2,832
Weighted Average Useful Life (in Years)	1 year 10 months 24 days	4 years
Software Development Not Yet Placed In Service
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 31,971	$ 21,840