Acquisitions and divestitures (Details Textuals) (USD $)	9 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Business Acquisition [Line Items]
Approximate annualized revenues of acquired businesses	$ 730,000,000
Purchase price of the business acquired	241,670,000
Business Acquisition, Contingent Consideration, Potential Cash Payment	12,146,000
Gain on bargain purchase	4,460,000	30,990,000
Gain on bargain purchase per share on a diluted basis	$ 0.03	$ 0.20
Recognized Loss From Other Activities Before Tax	1,399,000
Recognized Loss From Other Activities Net Of Tax	854,000
Recognized loss from other activities per diluted share	$ 0.01
Proceeds from Divestiture of Businesses	$ 0	$ 10,458,000