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Condensed Financial Information of Deswell Industries, Inc. (Details) $ in Thousands, ¥ in Millions | Mar. 31, 2026 USD ($) | Mar. 31, 2026 CNY (¥) | Mar. 31, 2025 USD ($) | Mar. 31, 2025 CNY (¥)
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Condensed Financial Information of Deswell Industries, Inc. [Abstract] |  |  |  |
Net assets of subsidiaries restricted amount | $ 47,761 | ¥ 314 | $ 51,984 | ¥ 376

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