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Components of marketable securities (Details) - Commercial PaperAnd Corporate Bonds [Member] - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2023 | May 31, 2022
Marketable Securities [Line Items] |  |
Amortized Cost | $ 83,549 | $ 339,540
Unrealized gains | 0 | 7
Unrealized Losses | (1,220) | (2,969)
Fair Value | $ 82,329 | $ 336,578

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