Related party transactions (Details 1) |
Sep. 30, 2025
USD ($)
|
Sep. 30, 2025
CNY (¥)
|
Mar. 31, 2025
USD ($)
|
Mar. 31, 2025
CNY (¥)
|
Mar. 31, 2024
CNY (¥)
|
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| Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] | ||||||||||||||
| Amounts due to related parties | $ 1,199,385 | ¥ 8,538,422 | $ 2,824,796 | ¥ 20,109,722 | ¥ 19,173,936 | |||||||||
| Minghui Liu [Member] | ||||||||||||||
| Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] | ||||||||||||||
| Amounts due to related parties | 1,110,314 | [1] | 7,904,327 | [1] | 2,727,680 | [2] | 19,418,353 | [1] | 18,980,310 | [2] | ||||
| Conggang Chen [Member] | ||||||||||||||
| Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] | ||||||||||||||
| Amounts due to related parties | $ 89,071 | ¥ 634,095 | $ 97,116 | ¥ 691,369 | ¥ 193,626 | |||||||||
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