Interest Expense - Schedule of Interest Expense (Details) ¥ in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
Sep. 30, 2024 CNY (¥)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 CNY (¥)	Mar. 31, 2024 CNY (¥)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 CNY (¥)	Mar. 31, 2022 CNY (¥)
Schedule of Interest Expense [Abstract]
Amortization charges on promissory notes				¥ 5,058		¥ 9,706	¥ 17,144
Interest expense on borrowings				2,268		3,644	3,740
Total	¥ 3,163	$ 451	¥ 3,079	¥ 7,326	$ 1,015	¥ 13,350	¥ 20,884

Amount of amortization expense attributable to debt issuance costs.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-3

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