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Income Taxes (Details 2) | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Profits tax rate in Hong Kong | 16.50% | 16.50% | 16.50%
Non-deductible items/non-taxable income | 3.30% | 2.10% | 15.20%
Changes in valuation allowances | (0.40%) | (1.40%) | (5.90%)
Overprovision of profits tax in prior year | 4.30% | (2.10%) | (0.50%)
Effect of different tax rate of subsidiaries operating in other jurisdictions | 1.90% | 4.30% | 2.80%
Tax effect of tax losses not recognized | (30.00%) | 0.00% | 1.10%
Utilization of tax losses previously not recognized | 12.70% | (1.00%) | (7.10%)
Others | (0.80%) | 6.20% | 8.90%
Effective tax rate | 3.70% | 24.60% | 31.00%

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