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Interests of subsidiaries (Tables)
12 Months Ended
Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of subsidiaries
Name of company 

Place of incorporation and kind of legal entity

    Percentage of capital held by the Company  Principal activities
        2018  2019   
Bonso Electronics Limited *
(“BEL”)
  Hong Kong,
limited liability company
     100%   100%  Investment holding, providing management and administrative support to the Group companies
                   
Bonso Investment Limited
(“BIL”)
  Hong Kong,
limited liability company
     100%   100%  Investment holding and property investment
                   
Bonso Electronics (Shenzhen) Company, Limited
(“BESCL”)
  PRC,
limited liability company
     100%   100%  Investment holding and property rental
                   
Bonso Advanced Technology Limited *
(“BATL”)
  Hong Kong,
limited liability company
     100%   100%  Investment holding and trading of scales and pet electronics products
                   
Bonso Advanced Technology (Xinxing) Company, Limited
(“BATXXCL”)
  PRC,
limited liability company
     100%   100%  Production of scales and pet electronics products and property rental
                   
Bonso Technology (Shenzhen) Company, Limited
(“BTL”)
  PRC,
limited liability company
     100%   100%  Product development