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Goodwill and intangible assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 28, 2019	Jun. 29, 2019	Jun. 30, 2018	Jul. 04, 2009
Carrying amount of goodwill, by reportable segment
Carrying value	$ 876,728
Additions from acquisitions	25,967
Foreign currency translation	13,363
Carrying value	916,058
Accumulated Impairment		$ 137,396	$ 181,440	$ 1,045,110
Electronic Components
Carrying amount of goodwill, by reportable segment
Carrying value	390,896
Additions from acquisitions	25,967
Foreign currency translation	361
Carrying value	417,224
Farnell
Carrying amount of goodwill, by reportable segment
Carrying value	485,832
Additions from acquisitions	0
Foreign currency translation	13,002
Carrying value	$ 498,834