Acquisitions and divestitures (Details Textuals) (USD $)	3 Months Ended			6 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Dec. 31, 2011	Dec. 29, 2012 business	Dec. 31, 2011
Business Acquisition [Line Items]
Number of Businesses Acquired				9
Approximate annualized revenues of acquired businesses				$ 1,010,000,000
Purchase price of the business acquired	188,200,000			188,200,000
Contingent earn-out obligations	12,800,000			12,800,000
Gain on bargain purchase	1,727,000	31,291,000		33,108,000
Gain on bargain purchase per share on a diluted basis	$ 0.01	$ 0.22		$ 0.23
Gain on bargain purchase and other	59,000		(1,399,000)	31,350,000	(1,399,000)
Divestiture of business, proceeds received from earn-out				3,613,000	0
Divestiture of Businesses, Earn Out Term				3 years
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
TS Asia [Member]
Business Acquisition [Line Items]
Loss on Sale of Business Pre-Tax	1,667,000
Loss on Sale of Business Net of Tax	$ 1,704,000
Loss on Sale of Business Per Share on a Diluted Basis	$ 0.01