For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details

Summary of principal accounting policies (Details 1)	6 Months Ended			12 Months Ended
Summary of principal accounting policies (Details 1)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 CNY (¥)	Sep. 30, 2024 CNY (¥)	Mar. 31, 2025 USD ($)	Mar. 31, 2025 CNY (¥)	Mar. 31, 2024 CNY (¥)
Product Information [Line Items]
Total revenue	$ 7,092,302	¥ 50,490,097	¥ 42,299,076	$ 15,449,939	¥ 109,988,114	¥ 41,606,354
Sales Revenue [Member] \| Product Concentration Risk [Member] \| Total Revenues [Member]
Product Information [Line Items]
Total revenue percentage	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%
Sports Related Product Sales [Member]
Product Information [Line Items]
Total revenue	$ 6,549,368	¥ 46,624,953	¥ 3,026,651	$ 997,378	¥ 7,100,332	¥ 41,592,608
Sports Related Product Sales [Member] \| Sales Revenue [Member] \| Product Concentration Risk [Member] \| Total Revenues [Member]
Product Information [Line Items]
Total revenue percentage	92.30%	92.30%	7.20%	6.50%	6.50%	99.90%
DAKA Merchant Membership Services Revenue [Member]
Product Information [Line Items]
Total revenue	$ 542,934	¥ 3,865,144	¥ 39,037,736	$ 14,419,594	¥ 102,653,093	¥ 0
DAKA Merchant Membership Services Revenue [Member] \| Sales Revenue [Member] \| Product Concentration Risk [Member]
Product Information [Line Items]
Total revenue percentage	100.00%	100.00%	100.00%	100.00%	100.00%	0.00%
DAKA Merchant Membership Services Revenue [Member] \| Sales Revenue [Member] \| Product Concentration Risk [Member] \| Total Revenues [Member]
Product Information [Line Items]
Total revenue percentage	7.70%	7.70%	92.30%	93.30%	93.30%	0.00%
Other Revenue [Member]
Product Information [Line Items]
Total revenue	$ 0	¥ 0	¥ 234,689	$ 32,967	¥ 234,689	¥ 13,746
Other Revenue [Member] \| Sales Revenue [Member] \| Product Concentration Risk [Member] \| Total Revenues [Member]
Product Information [Line Items]
Total revenue percentage	0.00%	0.00%	0.50%	0.20%	0.20%	0.10%