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Income taxes - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 | Feb. 28, 2021 | Feb. 29, 2020 | Feb. 28, 2019 | Feb. 28, 2018
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense |  | $ 15,484,000 | $ 13,607,000 | $ 13,776,000 |
Foreign earnings repatriated |  | 48,300,000 |  |  |
Undistributed earnings of foreign subsidiaries |  | 23,000,000.0 |  |  |
U S tax liability for income generated in Macau |  | 0 |  |  |
Net increase in valuation allowance |  | 900,000 |  |  |
Unrecognized tax benefits that would affect effective tax rate if recognized |  |  | 5,400,000 |  |
Liability for tax-related interest and penalties included in unrecognized tax benefits |  | 2,900,000 | 100,000 |  |
Tax-related interest and penalties expense included in provisions for income tax |  | $ 2,900,000 | $ 500,000 | 500,000 |
Tax Year 2018 |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
One-time income tax benefit |  |  |  |  | $ 17,900,000
Income tax expense |  |  |  | $ 9,400,000 |
Minimum |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Change in effective tax rate |  | 1.50% |  |  |
Maximum |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Change in effective tax rate |  | 2.00% |  |  |
COVID-19 |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
One-time income tax benefit, CARES Act | $ 9,400,000 |  |  |  |
State |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax assessment |  | $ 6,000,000.0 |  |  |
Settlement of tax assessment |  | $ 500,000 |  |  |

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