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Long-term debt - Summary of Principal Payment on Long Term Debt Including Obligation Under Capital Lease (Detail) - USD ($)
$ in Thousands
Mar. 26, 2016
Mar. 28, 2015
Debt Disclosure [Abstract]    
2017 $ 5,670  
2018 3,580  
2019 35,049  
2020 1,637  
2021 5,738  
Thereafter 1,500  
Long-term debt and Capital lease obligations $ 53,174 $ 56,784