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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details)
6 Months Ended 12 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Mar. 31, 2024
Developed Technology Rights      
Intangible Asset, Acquired, Finite-Lived [Line Items]      
Acquired finite-lived intangible assets, useful life (in years) 5 years 5 years 3 years
Customer Relationships      
Intangible Asset, Acquired, Finite-Lived [Line Items]      
Acquired finite-lived intangible assets, useful life (in years) 10 years