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Goodwill and intangible assets (Estimated Future Amortization Expense) (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Fiscal Year:  
Remainder of fiscal 2015 $ 21,392us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016 32,780us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2017 30,855us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2018 22,384us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2019 18,789us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2020 14,672us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter 11,393us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Total $ 152,265us-gaap_FiniteLivedIntangibleAssetsNet