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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. 31, 2018
Mar. 25, 2017
Debt Disclosure [Abstract]    
2019 $ 2,611  
2020 2,026  
2021 101  
2022 92  
2023 38  
Thereafter 1,500  
Long-term debt and Capital lease obligations $ 6,368 $ 6,450