Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

DESCRIPTION OF BUSINESS, ORGANIZATION AND SIGNIFICANT CONCENTRATIONS AND RISKS - VIE Agreements (Details)

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DESCRIPTION OF BUSINESS, ORGANIZATION AND SIGNIFICANT CONCENTRATIONS AND RISKS - VIE Agreements (Details) - CNY (¥)
¥ in Millions
1 Months Ended 12 Months Ended
Mar. 15, 2018
Mar. 31, 2018
Dec. 31, 2018
Mar. 19, 2019
Dec. 28, 2018
ATA Testing | ATA Intelligent Learning's nominee shareholders, Mr. Kevin Xiaofeng Ma, and Mr. Haichang Xiong          
Variable Interest Entity          
Loan amount   ¥ 10.0      
Term of loan   10 years      
ATA Testing | ATA Intelligent Learning's nominee shareholders, Mr. Kevin Xiaofeng Ma, and Mr. Haichang Xiong | Subsequent Events          
Variable Interest Entity          
Loan amount       ¥ 30.0  
ATA Testing | ATA Intelligent Learning's nominee shareholders, Mr. Kevin Xiaofeng Ma, and Mr. Haichang Xiong | Loan on March 15, 2018          
Variable Interest Entity          
Loan amount ¥ 1.0        
Term of loan     9 years 2 months 12 days    
ATA Testing | ATA Intelligent Learning's nominee shareholders, Mr. Kevin Xiaofeng Ma, and Mr. Haichang Xiong | Loan on December 28, 2018          
Variable Interest Entity          
Loan amount         ¥ 9.0
Term of loan     10 years    
ATA Intelligent Learning | ATA Testing          
Variable Interest Entity          
Percentage of equity interest that can be acquired as per exclusive purchase option     100.00%    
Term of agreement 30 years        
Amount that can be acquired from the shareholders of ATA Intelligent Learning   ¥ 10.0      
Notice period prior to expiration of agreement   30 days      
ATA Intelligent Learning | ATA Testing | Exclusive technical consulting and services agreement          
Variable Interest Entity          
Automatic renewal term of the agreement 10 years        
Notice period prior to expiration of agreement 3 months        
Mr. Kevin Xiaofeng Ma | ATA Intelligent Learning | Minimum          
Variable Interest Entity          
Total ordinary shares issued and outstanding held (as a percentage)     50.00%    
Mr. Kevin Xiaofeng Ma | ATA Intelligent Learning          
Variable Interest Entity          
Legal ownership interest (as a percent)     90.00%    
Mr. Haichang Xiong | ATA Intelligent Learning          
Variable Interest Entity          
Legal ownership interest (as a percent)     10.00%