Segment information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017
Sales, by segment
Sales	$ 5,048,980	$ 4,521,636	$ 10,138,859	$ 9,182,578
Operating income (expense):
Restructuring, integration and other expenses	(62,260)	(36,762)	(77,048)	(83,156)
Amortization of acquired intangible assets and other	(20,513)	(21,877)	(41,440)	(47,462)
Operating income	96,050	81,617	242,866	146,185
Segment
Operating income (expense):
Operating income	198,195	163,299	400,900	335,532
Electronic Components
Operating income (expense):
Operating income	158,551	129,848	320,464	269,449
Electronic Components | Segment
Sales, by segment
Sales	4,680,714	4,163,519	9,391,540	8,470,769
Premier Farnell
Operating income (expense):
Operating income	39,644	33,451	80,436	66,083
Premier Farnell | Segment
Sales, by segment
Sales	368,266	358,117	747,319	711,809
Business Support | Corporate
Operating income (expense):
Corporate	$ (19,372)	$ (23,043)	$ (39,546)	$ (58,729)