Related party transactions (Details) |
Sep. 30, 2025
USD ($)
|
Sep. 30, 2025
CNY (¥)
|
Mar. 31, 2025
USD ($)
|
Mar. 31, 2025
CNY (¥)
|
Mar. 31, 2024
CNY (¥)
|
|---|---|---|---|---|---|
| Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] | |||||
| Amounts due from related parties | $ 63,071 | ¥ 449,000 | $ 188,088 | ¥ 1,339,000 | ¥ 126,400 |
| Lirong Liu [Member] | |||||
| Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] | |||||
| Amounts due from related parties | $ 63,071 | ¥ 449,000 | $ 188,088 | ¥ 1,339,000 | ¥ 126,400 |