Goodwill and intangible assets Textuals (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 28, 2020	Jun. 27, 2020	Jun. 29, 2019	Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment expense		$ 118,731
Weighted average life of intangible assets		2 years
Intangible asset amortization expense		$ 81,139	$ 83,682	$ 91,475
Impairment of long lived assets including intangible assets		25,400
Investment impairment		15,300
Electronic Components
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment expense	$ 120,500	$ 118,731