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Income Taxes (Details 2)	12 Months Ended
	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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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference between statutory income tax rates in foreign jurisdictions and the domestic federal statutory income tax rate recorded during the period.

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Utilization of tax losses previously not recognized.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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