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Income taxes - Unrecognized tax benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Feb. 28, 2021 | Feb. 29, 2020
Unrecognized Tax Benefits |  |
Total unrecognized tax benefits, beginning balance | $ 113 | $ 3,205
Tax positions taken during the current period | 1,542 | 0
Changes in tax positions taken during a prior period | 4,280 |
Changes in tax positions taken during a prior period |  | (2,819)
Settlements | (499) | (273)
Total unrecognized tax benefits, ending balance | 5,436 | 113
Less current unrecognized tax benefits | 0 | 0
Non-current unrecognized tax benefits | $ 5,436 | $ 113

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