| Property plant and equipment |
| (i) | Recognition and measurement |
Items of property, plant and equipment are measured at cost less accumulated amortization and accumulated impairment losses. When parts of an item of property, plant and equipment have different useful lives, they are accounted for as separate items (major components) of property, plant and equipment. The costs of the day-to-day servicing of property, plant and equipment are recognized in the consolidated statements of net income and comprehensive income in the period in which they are incurred.
| (ii) | Amortization |
Amortization is recognized in profit or loss over the estimated useful lives of each part of an item of property, plant and equipment in a manner that most closely reflects the expected pattern of consumption of the future economic benefits embodied in the asset. The estimated useful lives for the current and comparative periods are as follows:
| Asset | Basis | Rate | ||||
| Buildings | Straight-line | 3% to 4% | ||||
| Computers, office equipment, furniture and fixtures | Straight-line/Diminishing balance | 20% to 25% | ||||
| Machinery and equipment | Straight-line | 20% to 25% | ||||
| Leasehold improvements | Straight-line | Term of lease |
Amortization methods, useful lives and residual values are reviewed at each period end and adjusted if appropriate.