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Long-term debt - Summary of Long Term Debt (Parenthetical) (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Mar. 25, 2017 USD ($) Installment | Mar. 25, 2017 CAD Installment | Mar. 26, 2016 USD ($) Installment | Mar. 26, 2016 CAD Installment | Mar. 28, 2015 USD ($) | Mar. 25, 2017 CAD | Mar. 26, 2016 CAD
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Periodic payment |  | $ 8,777 |  | $ 2,956 |  | $ 1,144 |  |
Term Loan from Investissement Quebec Prime Plus Seven Percent [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  | $ 2,141 |  | $ 2,786 |  |  |  |
Annual rate of prime plus |  | 7.00% |  | 7.00% |  |  | 7.00% | 7.00%
Number of installments | Installment |  | 60 | 60 | 60 | 60 |  |  |
Capital repayments |  | $ 62,314 | CAD 83,333,000 | $ 62,314 | CAD 83,333,000 |  |  |
Balance of term loan | CAD |  |  |  |  |  |  | CAD 2,900,000 | CAD 3,700,000
Term Loan from Investissement Quebec Prime Plus Five Point Five Percent [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  | $ 779 |  | $ 2,355 |  |  |  |
Annual rate of prime plus |  | 5.50% |  | 5.50% |  |  | 5.50% | 5.50%
Number of installments | Installment |  | 48 | 48 | 48 | 48 |  |  |
Capital repayments |  | $ 155,786 | CAD 208,333,000 | $ 155,786 | CAD 208,333,000 |  |  |
Balance of term loan | CAD |  |  |  |  |  |  | CAD 1,000,000 | CAD 3,100,000
Land and Building [Member] | Capital Leasing Arrangements [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding amount of repayment | CAD |  |  |  |  |  |  | CAD 0 | CAD 12,100,000
Minimum [Member] | Capital Leasing Arrangements [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage Rate |  | 3.60% |  | 3.60% |  |  | 3.60% | 3.60%
Maximum [Member] | Capital Leasing Arrangements [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage Rate |  | 14.90% |  | 14.90% |  |  | 14.90% | 14.90%
Term Loan Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  | $ 26,952 |  | $ 32,186 |  |  |  |
Term Loan Facility [Member] | Senior Subordinated Loans [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility Repayment Date |  | May 31, 2021 | May 31, 2021 | May 31, 2021 | May 31, 2021 |  |  |
Term Loan Facility [Member] | Senior Subordinated Loans [Member] | Libor Plus Nine Point Seven Five Percent [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  | $ 28,000 |  | $ 28,000 |  |  |  |
Debt Periodic payment | $ 5,000 |  |  |  |  |  |  |
Interest rate description |  | LIBOR plus 9.75% | LIBOR plus 9.75% | LIBOR plus 9.75% | LIBOR plus 9.75% |  |  |
Long-term debt interest rate |  | 9.75% | 9.75% | 9.75% | 9.75% |  |  |
Term Loan from Investissement Quebec Prime Plus Ten Percent [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  | $ 1,061 |  | $ 1,383 |  |  |  |
Annual rate of prime plus |  | 10.00% |  | 10.00% |  |  | 10.00% | 10.00%
Capital repayment period |  | 48 months | 48 months | 48 months | 48 months |  |  |
Periodic principal payment due |  | $ 31,157 | CAD 41,667,000 | $ 31,157 | CAD 41,667,000 |  |  |
Outstanding amount of repayment | CAD |  |  |  |  |  |  | CAD 1,400,000 | CAD 1,800,000
Cash Contribution [Member] | Montrovest BV [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  | $ 1,500 |  | $ 1,500 |  |  |  |
Interest on Cash advances |  | 11.00% | 11.00% | 11.00% | 11.00% |  |  |
Term Loan Facility Repaid In May Two Thousand Sixteen [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 1,215 |  |  |  |
Term Loan Facility Repaid In May Two Thousand Sixteen [Member] | Senior Subordinated Loans [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility Repayment Date |  | May 31, 2016 | May 31, 2016 | May 31, 2016 | May 31, 2016 |  |  |
Term Loan Facility Repaid In May Two Thousand Sixteen [Member] | Senior Subordinated Loans [Member] | Libor Plus Nine Point Seven Five Percent [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate description |  | LIBOR plus 9.75% | LIBOR plus 9.75% | LIBOR plus 9.75% | LIBOR plus 9.75% |  |  |
Long-term debt interest rate |  | 9.75% | 9.75% | 9.75% | 9.75% |  |  |

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