| Fair value of financial instruments |
| | Fair Value Measurements as at August 31, 2021 | | | | Carrying Amount | | | Fair Value | | | Level in the hierarchy | | Instruments measured at amortized cost: | | | | | | | | | | Long-term debt | | $ | 4,238,028 | | | $ | 4,253,605 | | | Level 2 | |
| | Fair Value Measurements at February 28, 2021 | | | | Carrying Amount | | | Fair Value | | | Level in the hierarchy | | Instruments measured at amortized cost: | | | | | | | | | | Long-term debt | | $ | 2,454,123 | | | $ | 2,464,540 | | | Level 2 | |
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