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SUBSEQUENT EVENTS (Details) - Subsequent events
¥ in Millions
Apr. 25, 2018
CNY (¥)
Apr. 17, 2018
CNY (¥)
Apr. 09, 2018
CNY (¥)
item
SUBSEQUENT EVENTS      
Percentage of equity interest     80.00%
Number of kindergartens | item     4
Business combination, consideration of cash   ¥ 23.8 ¥ 27.0
Minimum | Acquisiton of a group of kindergartens and certain assets in 0-6 year old education servicess business      
SUBSEQUENT EVENTS      
Business combination, group of certain assets education services 0 years    
Maximum | Acquisiton of a group of kindergartens and certain assets in 0-6 year old education servicess business      
SUBSEQUENT EVENTS      
Business combination, group of certain assets education services 6 years    
Total consideration of acquisition ¥ 620.0