Goodwill and intangible assets Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 27, 2015	Jun. 28, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Acquired Amount	$ 295,470	$ 344,322
Accumulated Amortization	(195,739)	(160,014)
Net Book Value	99,731	184,308
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Acquired Amount	276,921	319,496
Accumulated Amortization	(190,593)	(155,604)
Net Book Value	86,328	163,892
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Acquired Amount	6,240	5,993
Accumulated Amortization	(3,792)	(1,555)
Net Book Value	2,448	4,438
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Acquired Amount	12,309	18,833
Accumulated Amortization	(1,354)	(2,855)
Net Book Value	$ 10,955	$ 15,978