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Derivative financial instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Net derivative financial instrument (loss) gain $ 3,354 $ 26 $ 5,070 $ (8,711)
Other expenses, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative financial loss       $ 35,000