Goodwill and intangible assets (Intangible Assets) (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Jun. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 277,607	$ 260,667
Accumulated Amortization	(96,412)	(79,328)
Net Book Value	181,195	181,339
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	266,183	248,105
Accumulated Amortization	(92,948)	(76,645)
Net Book Value	173,235	171,460
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,926	3,690
Accumulated Amortization	(1,876)	(1,279)
Net Book Value	2,050	2,411
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,320	3,820
Accumulated Amortization	(1,150)	(970)
Net Book Value	2,170	2,850
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,178	5,052
Accumulated Amortization	(438)	(434)
Net Book Value	$ 3,740	$ 4,618