Acquisitions and divestitures (Details Textuals) (USD $)	3 Months Ended
	Sep. 29, 2012 business	Oct. 01, 2011
Business Acquisition [Line Items]
Number of Businesses Acquired	5
Approximate annualized revenues of acquired businesses	$ 330,000,000
Purchase price of the business acquired	97,930,000
Business Acquisition, Contingent Consideration, Potential Cash Payment	10,373,000
Divestiture of business, proceeds received from earn-out	4,500,000	0
Divestiture of Businesses, Earn Out Term	3 years
Gain on bargain purchase	$ 31,291,000	$ 0
Gain on bargain purchase per share on a diluted basis	$ 0.22