Commitments and contingencies (Table) (Details) $ in Thousands	Dec. 30, 2017 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 19,048
Operating Leases, Future Minimum Payments, Due in Two Years	15,820
Operating Leases, Future Minimum Payments, Due in Three Years	13,250
Operating Leases, Future Minimum Payments, Due in Four Years	8,902
Operating Leases, Future Minimum Payments, Due in Five Years	7,011
Operating Leases, Future Minimum Payments, Due Thereafter	7,868
Operating Leases, Future Minimum Payments Due, Total	$ 71,899