Goodwill and intangible assets Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Jun. 27, 2020	Jun. 29, 2019
Finite-Lived Intangible Assets [Line Items]
Acquired amount		$ 406,276	$ 408,779
Accumulated Amortization		(340,839)	(265,259)
Net Book Value		65,437	143,520
Intangible asset impairment	$ 17,473
Customer related
Finite-Lived Intangible Assets [Line Items]
Acquired amount		300,937	292,266
Accumulated Amortization		(266,759)	(208,329)
Net Book Value		34,178	83,937
Trade name
Finite-Lived Intangible Assets [Line Items]
Acquired amount		51,698	52,760
Accumulated Amortization		(32,493)	(24,752)
Net Book Value		19,205	28,008
Other
Finite-Lived Intangible Assets [Line Items]
Acquired amount		53,641	63,753
Accumulated Amortization		(41,587)	(32,178)
Net Book Value		$ 12,054	$ 31,575