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LONG-TERM DEBT (Additional Information) (Details)
CAD in Thousands
Sep. 30, 2017
USD ($)
Jul. 14, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 27, 2015
USD ($)
Mar. 27, 2015
CAD
Debt Instrument [Line Items]          
Long-term debt, gross $ 151,068,000   $ 121,196,000    
Unused borrowing capacity reserve   $ 15,000,000      
First Lien Credit Agreement          
Debt Instrument [Line Items]          
Principal amount outstanding 151,068,000        
Credit Facilities          
Debt Instrument [Line Items]          
Fee on unused borrowings, percent       0.25% 0.25%
Maximum unused commitment before rate change       50.00% 50.00%
Credit Facilities | Maximum          
Debt Instrument [Line Items]          
Fee on unused borrowings, percent       0.375% 0.375%
Credit Facilities | United States of America, Dollars          
Debt Instrument [Line Items]          
Unused borrowing capacity, amount $ 3,473,000        
Credit Facilities | Canadian Revolving Facility | Revolving Credit Facility | Canadian Guarantors          
Debt Instrument [Line Items]          
Effective interest rate including effect of interest rate swap contracts 6.27%   3.70%    
Long-term debt, gross $ 69,711,000   $ 46,996,000    
Credit Facilities | Canadian Revolving Facility | Revolving Credit Facility | Canadian Guarantors | United States of America, Dollars          
Debt Instrument [Line Items]          
Authorized amount of line of credit       $ 80,000,000  
Credit Facilities | Canadian Revolving Facility | Revolving Credit Facility | Canadian Guarantors | Canada, Dollars | Swing Line Facility          
Debt Instrument [Line Items]          
Authorized amount of line of credit | CAD         CAD 8,000
Credit Facilities | US Revolving Facility | Revolving Credit Facility | US Guarantors          
Debt Instrument [Line Items]          
Effective interest rate including effect of interest rate swap contracts 6.24%   3.81%    
Long-term debt, gross $ 81,357,000   $ 74,200,000    
Credit Facilities | US Revolving Facility | Revolving Credit Facility | US Guarantors | United States of America, Dollars          
Debt Instrument [Line Items]          
Authorized amount of line of credit       90,000,000  
Credit Facilities | US Revolving Facility | Revolving Credit Facility | US Guarantors | United States of America, Dollars | Swing Line Facility          
Debt Instrument [Line Items]          
Authorized amount of line of credit       $ 9,000,000