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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%