Summary of principal accounting policies (Details Narrative) |
6 Months Ended | 12 Months Ended | ||||||||
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Sep. 30, 2025
USD ($)
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Sep. 30, 2025
CNY (¥)
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Sep. 30, 2024
CNY (¥)
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Mar. 31, 2025
USD ($)
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Mar. 31, 2025
CNY (¥)
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Mar. 31, 2024
USD ($)
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Mar. 31, 2024
CNY (¥)
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Mar. 31, 2023
CNY (¥)
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Sep. 30, 2025
CNY (¥)
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Mar. 31, 2025
CNY (¥)
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| Property, Plant and Equipment [Line Items] | ||||||||||
| Convenience translation, description | the convenience of the readers and were calculated at the rate of USD1.00=RMB7.119 | the convenience of the readers and were calculated at the rate of USD1.00=RMB7.119 | the convenience of the readers and were calculated at the rate of USD1.00=RMB7.119 | the convenience of the readers and were calculated at the rate of USD1.00=RMB7.119 | ||||||
| Non-controlling interests | $ 19,320 | $ 30,789 | ¥ 0 | ¥ 137,537 | ¥ 219,174 | |||||
| Impairment of long-lived assets | ¥ 0 | ¥ 0 | 0 | |||||||
| Deferred offering costs | 826,826 | 531,206 | 1,599,851 | 5,886,177 | 3,781,659 | |||||
| Impairment for operating lease right-of-use lease assets | 0 | ¥ 0 | 0 | 0 | ||||||
| Contract liabilities | 1,215,199 | 1,475,309 | 27,893,632 | 8,651,000 | 10,502,722 | |||||
| Revenue recognized included in contract liabilities | (1,851,722) | 27,893,632 | 54,601,458 | $ 3,918,195 | 27,893,632 | ¥ 1,082,404 | ||||
| Employee benefit expenses | 127,535 | 907,923 | 484,097 | 144,592 | 1,029,354 | 654,722 | ||||
| Under payment of taxes | 14,047 | $ 14,047 | 100,000 | ¥ 100,000 | ||||||
| Other comprehensive loss | ¥ 0 | ¥ 0 | ¥ 0 | ¥ 0 | ||||||
| [custom:ContractsWithCustomerLiability-0] | $ 260,110 | ¥ 1,851,722 | ||||||||
| Minimum [Member] | ||||||||||
| Property, Plant and Equipment [Line Items] | ||||||||||
| VAT rates | 3.00% | 3.00% | 3.00% | 3.00% | ||||||
| Maximum [Member] | ||||||||||
| Property, Plant and Equipment [Line Items] | ||||||||||
| VAT rates | 6.00% | 6.00% | 6.00% | 6.00% | ||||||
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Description of why the actual reporting currency-denominated balances differ from the amounts reported for financial reporting purposes, including the reasons for using two different rates with respect to remeasurement and translation. For example, in certain jurisdictions, companies may utilize an official exchange rate and also a parallel rate. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition 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 attributable to other adjustments. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of expense for employee benefit and equity-based compensation. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of equity (deficit) attributable to noncontrolling interest. Excludes temporary equity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of loss from impairment of right-of-use asset from operating lease. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount before tax, after reclassification adjustments of other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Details
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- Details
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