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Components of marketable securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2022 | May 31, 2021
Marketable Securities [Line Items] |  |
Amortized Cost | $ 339,540 | $ 305,279
Unrealized gains | 7 | 239
Unrealized Losses | (2,969) | (33)
Fair Value | 336,578 | 305,485
Commercial PaperAnd Corporate Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 339,540 | 299,524
Unrealized gains | 7 | 209
Unrealized Losses | (2,969) | (33)
Fair Value | 336,578 | 299,700
Certificates of Deposit [Member] |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 0 | 5,755
Unrealized gains | 0 | 30
Unrealized Losses | 0 | 0
Fair Value | $ 0 | $ 5,785

X
- Definition Amount of unrealized gain on investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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