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Pension and other post-retirement benefits - Expected Benefit Payments (Detail)
CAD in Thousands
Dec. 31, 2017
CAD
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 CAD 43,445
2019 39,037
2020 40,132
2021 45,060
2022 45,108
2023-2027 236,821
Post Retirement Benefit Plan  
Defined Benefit Plan Disclosure [Line Items]  
2018 7,353
2019 7,989
2020 8,845
2021 9,425
2022 10,093
2023-2027 CAD 58,844