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Income taxes - Unrecognized tax benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
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