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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Revenue, Major Customer [Line Items] |  |  |  |
Single non-related party | $ 526,107 | $ 586,139 | $ 1,059,530 | $ 1,041,138
Single non-related party | Revenue benchmark | Customer concentration risk |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Single non-related party | $ 101,759 | $ 79,011 | $ 183,031 | $ 163,284

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