Taxes (Details)	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Taxes (Details) [Line Items]
Statutory income tax rate	22.40%	18.30%	14.50%
Income tax (''New EIT Law''), description	effective from January 1, 2008, both domestically-owned enterprises and foreign-invested enterprises are subject to a uniform tax rate of 25% while preferential tax rates, tax holidays and even tax exemption may be granted on case-by-case basis. EIT grants preferential tax treatment to High and New Technology Enterprises (“HNTEs”). Under this preferential tax treatment, HNTEs are entitled to an income tax rate of 15%, subject to a requirement that they re-apply for HNTE status every three years. Fujian Happiness, the Company’s main operating entity in PRC, was approved as HNTEs and is entitled to a reduced income tax rate of 15% from December 2019 to December 2022.
Hong Kong [Member]
Taxes (Details) [Line Items]
Statutory income tax rate	16.50%

Income tax (''New EIT Law''), description

effective from January 1, 2008, both domestically-owned enterprises and foreign-invested enterprises are subject to a uniform tax rate of 25% while preferential tax rates, tax holidays and even tax exemption may be granted on case-by-case basis. EIT grants preferential tax treatment to High and New Technology Enterprises (“HNTEs”). Under this preferential tax treatment, HNTEs are entitled to an income tax rate of 15%, subject to a requirement that they re-apply for HNTE status every three years. Fujian Happiness, the Company’s main operating entity in PRC, was approved as HNTEs and is entitled to a reduced income tax rate of 15% from December 2019 to December 2022.