Annual report pursuant to Section 13 and 15(d)

Intangible Assets, Net - Amortization Expense Intangible Assets (Details)

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Intangible Assets, Net - Amortization Expense Intangible Assets (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 28, 2021
May 31, 2022
May 31, 2021
May 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense   $ 700,000 $ 1,800,000 $ 2,000,000.0
Intangible asset impairment charge $ 10,000,000.0 0 10,049,000 $ 0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]        
2023   132,000.0    
Thereafter   0    
Total amortizable intangible assets, net   $ 132,000 $ 1,653,000