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Long-term debt - Summary of Long Term Debt (Parenthetical) (Detail) - USD ($) | 12 Months Ended
--- | ---
Mar. 30, 2019 | Mar. 31, 2018
Debt Instrument [Line Items] |  |
Net of deferred financing costs | $ 600,000 | $ 700,000
Term Loan from Investissement Quebec Prime Plus Seven Percent [Member] |  |
Debt Instrument [Line Items] |  |
Annual rate of prime plus | 7.00% | 7.00%
Balance of term loan | $ 5,000,000 | $ 5,000,000
Line of Credit Facility Repayment Date | Jun. 05, 2019 |
Term Loan from Investissement Quebec Prime Plus Ten Percent [Member] |  |
Debt Instrument [Line Items] |  |
Annual rate of prime plus | 10.00% | 10.00%
Balance of term loan | $ 2,000,000 | $ 2,000,000
Line of Credit Facility Repayment Date | Jun. 05, 2019 |
Capital Lease Obligations [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Interest Rate Stated Percentage Rate | 3.60% | 3.60%
Capital Lease Obligations [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Interest Rate Stated Percentage Rate | 25.80% | 25.80%
Cash Contribution one [Member] | Montel [Member] |  |
Debt Instrument [Line Items] |  |
Interest on Cash advances | 11.00% | 11.00%
Cash received from related party | $ 1,500,000 | $ 1,500,000
Cash Contribution Two [Member] | Montel [Member] |  |
Debt Instrument [Line Items] |  |
Interest on Cash advances | 11.00% | 11.00%
Cash received from related party | $ 2,500,000 | $ 2,500,000
Term Loan Facility Repayable At October Two Thousand Twenty Two [Member] | Term Loan From Crystal Financial LLC CDOR Plus Eight Point Two Five Percent [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Interest Rate Stated Percentage Rate | 8.25% |
Net of deferred financing costs | $ 378,000 |

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