Goodwill and intangible assets Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 27, 2020	Oct. 03, 2020
Finite-Lived Intangible Assets [Line Items]
Acquired amount	$ 406,276	$ 420,516
Accumulated Amortization	(340,839)	(373,068)
Net Book Value	65,437	47,448
Intangible asset impairment	17,473
Customer related
Finite-Lived Intangible Assets [Line Items]
Acquired amount	300,937	311,121
Accumulated Amortization	(266,759)	(291,936)
Net Book Value	34,178	19,185
Trade name
Finite-Lived Intangible Assets [Line Items]
Acquired amount	51,698	53,729
Accumulated Amortization	(32,493)	(35,914)
Net Book Value	19,205	17,815
Technology and other
Finite-Lived Intangible Assets [Line Items]
Acquired amount	53,641	55,666
Accumulated Amortization	(41,587)	(45,218)
Net Book Value	$ 12,054	$ 10,448