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Leases - Summary of Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2021
May 31, 2020
Cash paid for amounts included in the measurement of lease liabilities    
Operating cash flows from operating leases $ 1,466 $ 994
Operating cash flows from finance leases 774  
Financing cash flows from finance leases $ 231