Derivative financial instruments (Details) - Foreign Exchange Forward - USD ($)	12 Months Ended
	Jul. 02, 2016	Jun. 27, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Average length of time of Foreign exchange contracts	53 days	55 days
Other expenses, net | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative financial instrument gain (loss)	$ (2,338,900)	$ (4,478,100)