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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. 25, 2017
Mar. 26, 2016
Debt Disclosure [Abstract]    
2018 $ 2,810  
2019 1,191  
2020 712  
2021 27,057  
2022 65  
Thereafter 1,500  
Long-term debt and Capital lease obligations $ 33,335 $ 52,285