Debt - Other - Additional Information (Details) CAD in Millions	Jan. 15, 2015 CAD
Canadian subsidiary credit agreement
Debt
Revolving credit commitment	CAD 6.0
Canadian subsidiary credit agreement, Capital equipment
Debt
Revolving credit commitment	CAD 0.5
Basis spread on variable rate	0.90%
Canadian subsidiary credit agreement, Guarantees
Debt
Revolving credit commitment	CAD 0.4
Prime rate | Canadian subsidiary credit agreement, Operating activities
Debt
Basis spread on variable rate	0.20%