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Financial Instruments - Summary of Fair Value, Fair Value Level and Valuations Techniques and Inputs of Restricted Investments, Derivative Financial Instruments and Long-term Debt (Detail) - CAD ($)
$ in Millions
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Level 2 of fair value hierarchy [member] | Term loans [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying amount $ (29.5) $ (34.3) $ (32.3)
Fair value (28.6) (34.9) (36.5)
Level 2 of fair value hierarchy [member] | Restricted investment [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying amount 15.7 17.3 16.1
Fair value 15.7 17.3 16.1
Level 2 of fair value hierarchy [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying amount (5.5) (4.5) (8.7)
Fair value (5.5) (4.5) (8.7)
Level 2 of fair value hierarchy [member] | Derivative financial instruments [member] | Favourable forward exchange contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying amount 3.4 5.5 1.3
Fair value 3.4 5.5 1.3
Level 2 of fair value hierarchy [member] | Derivative financial instruments [member] | Unfavourable forward exchange contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying amount (6.9) (7.7) (7.8)
Fair value (6.9) (7.7) (7.8)
Level 2 of fair value hierarchy [member] | Derivative financial instruments [member] | Inflation rate swaps [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying amount (2.0) (2.3) (2.2)
Fair value (2.0) (2.3) (2.2)
Level 1 of fair value hierarchy [member] | Term facility [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying amount (1,176.9) (969.9) (907.5)
Fair value $ (1,161.4) $ (965.1) $ (909.8)