Income taxes (Details Textuals) (USD $)	3 Months Ended		6 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Effective tax rate	18.60%	29.30%	14.40%	29.20%
Recognized tax benefit related to settlement	$ 17,366,000