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Condensed financial information of the Company - Condensed balance sheets (parenthetical) (Details) - $ / shares
Mar. 31, 2023
Mar. 31, 2022
Sep. 01, 2021
May 29, 2020
Apr. 22, 2020
Condensed financial information of the Company          
Ordinary shares, par value $ 0.0002 $ 0.0002     $ 0.00015
Ordinary shares, shares authorized 500,000,000 500,000,000   500,000,000 500,000,000
Ordinary shares, shares issued 14,900,000 14,900,000      
Ordinary shares, shares outstanding 14,900,000 14,900,000 14,900,000 9,000,000 12,000,000
Reportable legal entities | Parent company          
Condensed financial information of the Company          
Ordinary shares, par value $ 0.0002 $ 0.0002      
Ordinary shares, shares authorized 500,000,000 500,000,000      
Ordinary shares, shares issued 14,900,000 14,900,000      
Ordinary shares, shares outstanding 14,900,000 14,900,000