Goodwill and intangible assets Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Jun. 29, 2019
Finite-Lived Intangible Assets [Line Items]
Acquired amount	$ 393,500	$ 408,779
Accumulated Amortization	(316,194)	(265,259)
Net Book Value	77,306	143,520
Intangible asset impairment	17,494
Customer related
Finite-Lived Intangible Assets [Line Items]
Acquired amount	290,199	292,266
Accumulated Amortization	(247,495)	(208,329)
Net Book Value	42,704	83,937
Trade name
Finite-Lived Intangible Assets [Line Items]
Acquired amount	50,627	52,760
Accumulated Amortization	(29,810)	(24,752)
Net Book Value	20,817	28,008
Technology and other
Finite-Lived Intangible Assets [Line Items]
Acquired amount	52,674	63,753
Accumulated Amortization	(38,889)	(32,178)
Net Book Value	$ 13,785	$ 31,575