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Capital Stock and Stock-Based Awards - Schedule of employee stock purchase plan activity (Details) - Employee Stock Purchase Plan - $ / shares | 12 Months Ended
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May 31, 2022 | May 31, 2021 | May 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issued | 59,322 | 67,097 | 65,714
Weighted average purchase price per share (in dollars per share) | $ 32.52 | $ 22.19 | $ 27.84

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