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SIGNIFICANT ACCOUNTING POLICIES - Acquired intangible assets (Details)
12 Months Ended
Feb. 28, 2022
Trade name and domain names | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Amortization period (in years) 1 year
Trade name and domain names | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Amortization period (in years) 10 years
Copyrights and teaching materials | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Amortization period (in years) 3 years
Copyrights and teaching materials | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Amortization period (in years) 10 years
User base and customer relationships | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Amortization period (in years) 3 years
User base and customer relationships | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Amortization period (in years) 7 years
Technology | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Amortization period (in years) 4 years
Technology | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Amortization period (in years) 6 years
Partnership agreements and school cooperation agreements | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Amortization period (in years) 4 years
Partnership agreements and school cooperation agreements | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Amortization period (in years) 6 years
Licenses | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Amortization period (in years) 2 years
Licenses | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Amortization period (in years) 9 years
Others | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Amortization period (in years) 1 year
Others | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Amortization period (in years) 7 years