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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Feb. 28, 2021
May 31, 2020
Leases [Abstract]    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets  
Operating lease ROU asset $ 9,945 $ 10,146
Current operating lease liabilities 2,363 2,077
Non-current operating lease liabilities 7,940 8,345
Total lease liabilities $ 10,303 $ 10,422
Weighted average remaining term (in years) 4 years 4 months 6 days  
Weighted average discount rate (percent) 3.80%  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other current liabilities Other current liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other long-term liabilities Other long-term liabilities