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Summary of Significant Accounting Policies (Details)
¥ in Thousands
 12 Months Ended
Mar. 31, 2024
CNY (¥)
Mar. 31, 2023
CNY (¥)
Mar. 31, 2022
CNY (¥)
Summary of Significant Accounting Policies [Line Items]      
Restricted cash ¥ 77,200 ¥ 72,400  
Allowances for accounts receivable 300 100  
Deferred revenue 2,174  
Other income 2,400 600 ¥ 2,900
Advertising and market promotion expenses   100 100
Shipping and handling fees amount 800 1,600 1,400
Research and development costs 16,600 16,000 14,100
Benefit expenses ¥ 1,000 1,300 1,100
Registered capital percentage 50.00%    
Reserves and surplus percentage 10.00%    
Statutory reserve funds
Exchange rate 7.095    
Minimum [Member]      
Summary of Significant Accounting Policies [Line Items]      
Estimated useful life 3 years    
Maximum [Member]      
Summary of Significant Accounting Policies [Line Items]      
Estimated useful life 10 years    
Government Grants [Member]      
Summary of Significant Accounting Policies [Line Items]      
Deferred revenue ¥ 6,200 8,700  
Supplier Concentration Risk [Member]      
Summary of Significant Accounting Policies [Line Items]      
Revenue 56,900    
Customer One [Member] | Revenue Benchmark [Member]      
Summary of Significant Accounting Policies [Line Items]      
Revenue 37,800 44,400  
Customer One [Member] | Accounts Receivable [Member]      
Summary of Significant Accounting Policies [Line Items]      
Revenue 11,000 14,000  
Customer Two [Member] | Revenue Benchmark [Member]      
Summary of Significant Accounting Policies [Line Items]      
Revenue 24,300 25,900  
Customer Two [Member] | Accounts Receivable [Member]      
Summary of Significant Accounting Policies [Line Items]      
Revenue 6,000 11,900  
Customer Three [Member] | Revenue Benchmark [Member]      
Summary of Significant Accounting Policies [Line Items]      
Revenue 20,000 25,800  
Customer Three [Member] | Accounts Receivable [Member]      
Summary of Significant Accounting Policies [Line Items]      
Revenue 4,500 9,400  
Customer Four [Member] | Accounts Receivable [Member]      
Summary of Significant Accounting Policies [Line Items]      
Revenue ¥ 3,900 ¥ 8,600  
Before May 1, 2018 [Member]      
Summary of Significant Accounting Policies [Line Items]      
Value added tax percentage 17.00%    
From May 1, 2018 to April 1, 2019 [Member]      
Summary of Significant Accounting Policies [Line Items]      
Value added tax percentage 16.00%    
After April 1, 2019 [Member]      
Summary of Significant Accounting Policies [Line Items]      
Value added tax percentage 13.00%