Capital Assets (Intangible Assets) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 28, 2020	Sep. 28, 2019
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (83,135)	$ (72,059)
Weighted Average Useful Life (in Years)	14 years 1 month 6 days	14 years 4 months 24 days
Total intangible assets	$ 427,486	$ 378,644
Intangible assets, net	344,351	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	46,228	39,546
Accumulated Amortization	(16,167)	(16,035)
Net Carrying Value	$ 30,061	$ 23,511
Weighted Average Useful Life (in Years)	5 years 10 months 24 days	6 years 2 months 12 days
Technology and patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 68,155	$ 63,015
Accumulated Amortization	(17,930)	(15,739)
Net Carrying Value	$ 50,225	$ 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	$ 28,674	$ 20,186
Accumulated Amortization	(4,497)	(3,808)
Net Carrying Value	$ 24,177	$ 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	$ 216,838	$ 192,488
Accumulated Amortization	(41,385)	(34,735)
Net Carrying Value	$ 175,453	$ 157,753
Weighted Average Useful Life (in Years)	15 years 6 months	15 years 7 months 6 days
Land-use rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,303	$ 2,303
Accumulated Amortization	(1,919)	(968)
Net Carrying Value	$ 384	$ 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	$ 7,788	$ 3,606
Accumulated Amortization	(1,237)	(774)
Net Carrying Value	$ 6,551	$ 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	$ 28,522	$ 21,840