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Goodwill and long-lived assets (Details) - USD ($)	6 Months Ended
Goodwill and long-lived assets (Details) - USD ($)	Dec. 29, 2018	Jun. 30, 2018	Jul. 04, 2009
Carrying amount of goodwill, by reportable segment
Carrying value	$ 980,872,000
Additions from acquisitions	49,412,000
Foreign currency translation	(19,716,000)
Carrying value	1,010,568,000
Accumulated Impairment		$ 181,440	$ 1,045,110
Electronic Components
Carrying amount of goodwill, by reportable segment
Carrying value	479,699,000
Additions from acquisitions	49,412,000
Foreign currency translation	(3,454,000)
Carrying value	525,657,000
Premier Farnell
Carrying amount of goodwill, by reportable segment
Carrying value	501,173,000
Foreign currency translation	(16,262,000)
Carrying value	$ 484,911,000