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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)
CAD in Millions
Sep. 30, 2016
collar_arrangement
$ / CAD
Apr. 30, 2016
CAD
collar_arrangement
Jun. 30, 2015
CAD
collar_arrangement
$ / CAD
Foreign Exchange Option/Maturing in 2016      
Derivative [Line Items]      
Number of derivative instruments held | collar_arrangement     4
Notional Amount | CAD     CAD 32.0
Exchange rate floor | $ / CAD     0.84
Exchange rate cap | $ / CAD     0.86
Foreign Exchange Option/Maturing in 2016 | Minimum      
Derivative [Line Items]      
Notional Amount | CAD     CAD 7.9
Foreign Exchange Option/Maturing in 2016 | Maximum      
Derivative [Line Items]      
Notional Amount | CAD     CAD 8.1
Forward Contract Maturing in 2017      
Derivative [Line Items]      
Number of derivative instruments held | collar_arrangement   4  
Notional Amount | CAD   CAD 33.5  
Number of derivative instruments maturing each quarter | collar_arrangement 1    
Exchange rate floor | $ / CAD 0.7804    
Exchange rate cap | $ / CAD 0.7809