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Income taxes - Income tax rates (Details)
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Hong Kong      
Income Tax Disclosure [Line Items]      
Income tax rate 16.50%    
Hong Kong | Tax rate for first first HKD2 million of assessable profits      
Income Tax Disclosure [Line Items]      
Income tax rate 8.25%    
Hong Kong | Tax rate for profit after first HKD2 million      
Income Tax Disclosure [Line Items]      
Income tax rate 16.50%    
Mainland China      
Income Tax Disclosure [Line Items]      
Income tax rate 25.00%    
Mainland China | Tax rate for pilot free trade zone      
Income Tax Disclosure [Line Items]      
Income tax rate 15.00%    
United States      
Income Tax Disclosure [Line Items]      
Income tax rate 21.00%    
State income tax rate 8.84%    
United States | Minimum.      
Income Tax Disclosure [Line Items]      
State income tax rate 6.25%    
United States | Maximum.      
Income Tax Disclosure [Line Items]      
State income tax rate 11.50%    
Indonesia      
Income Tax Disclosure [Line Items]      
Income tax rate 22.00% 22.00% 25.00%
India      
Income Tax Disclosure [Line Items]      
Income tax rate 26.00%    
Canada | Minimum.      
Income Tax Disclosure [Line Items]      
Income tax rate 23.00%    
Canada | Maximum.      
Income Tax Disclosure [Line Items]      
Income tax rate 31.00%    
Singapore      
Income Tax Disclosure [Line Items]      
Income tax rate 17.00%