Capital Assets (Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (77,032)	$ (72,059)
Weighted Average Useful Life (in Years)	14 years 3 months 18 days	14 years 4 months 24 days
Total intangible assets	$ 383,166	$ 378,644
Intangible assets, net	306,134	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	42,787	39,546
Accumulated Amortization	(16,101)	(16,035)
Net Carrying Value	$ 26,686	$ 23,511
Weighted Average Useful Life (in Years)	6 years	6 years 2 months 12 days
Technology and patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 63,327	$ 63,015
Accumulated Amortization	(16,864)	(15,739)
Net Carrying Value	$ 46,463	$ 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	$ 20,343	$ 20,186
Accumulated Amortization	(4,111)	(3,808)
Net Carrying Value	$ 16,232	$ 16,378
Weighted Average Useful Life (in Years)	18 years 4 months 24 days	18 years 4 months 24 days
Customer lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 193,227	$ 192,488
Accumulated Amortization	(37,908)	(34,735)
Net Carrying Value	$ 155,319	$ 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	$ 2,317	$ 2,303
Accumulated Amortization	(1,033)	(968)
Net Carrying Value	$ 1,284	$ 1,335
Weighted Average Useful Life (in Years)	25 years 9 months 18 days	25 years 8 months 12 days
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,665	$ 3,606
Accumulated Amortization	(1,015)	(774)
Net Carrying Value	$ 2,650	$ 2,832
Weighted Average Useful Life (in Years)	4 years	4 years
Software Development Not Yet Placed In Service
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 25,082	$ 21,840