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Fair Value Measurements (Details)
€ in Thousands, $ in Thousands
May 31, 2022
USD ($)
Feb. 28, 2022
USD ($)
Aug. 31, 2021
USD ($)
Sep. 01, 2020
USD ($)
Sep. 01, 2020
EUR (€)
Fair value measurements          
Long term debt outstanding $ 0   $ 0    
ABchime          
Fair value measurements          
Contingent consideration 2,099 $ 2,692   $ 928 € 780
Recurring basis          
Fair value measurements          
Restricted investments 2,312   2,260    
Contingent consideration 2,099   2,537    
Recurring basis | Quoted prices in active markets (Level 1)          
Fair value measurements          
Restricted investments 2,070   2,016    
Recurring basis | Significant other observable inputs (Level 2)          
Fair value measurements          
Restricted investments 242   244    
Recurring basis | Significant unobservable inputs (Level 3)          
Fair value measurements          
Contingent consideration $ 2,099   $ 2,537