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Income Taxes (Details 2) | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Profits tax rate in Hong Kong | 16.50% | 16.50% | 16.50%
Non-deductible items/non-taxable income | 26.90% | 3.30% | 2.10%
Changes in valuation allowances | 1.10% | (0.40%) | (1.40%)
Overprovision of profits tax in prior year |  | 4.30% | (2.10%)
Effect of different tax rate of subsidiaries operating in other jurisdictions | 1.80% | (1.90%) | 4.30%
Tax effect of tax losses not recognized | 0.10% | (30.00%) | 0.00%
Utilization of tax losses previously not recognized | (11.60%) | 12.70% | (1.00%)
Others | (11.50%) | (0.80%) | 6.20%
Effective tax rate | 23.30% | 3.70% | 24.60%

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