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Condensed Financial Information of Deswell Industries, Inc. (Narrative) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($) | Mar. 31, 2016 CNY (¥) | Mar. 31, 2015 CNY (¥)
Related Party Transaction [Line Items] |  |  |  |  |
Net assets of subsidiaries restricted from transfer to the parent company | $ 72,890 | $ 76,674 |  |  |
China, Yuan Renminbi |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Net assets of subsidiaries restricted from transfer to the parent company | ¥ |  |  |  | ¥ 479,000 | ¥ 479,000
Subsidiary of Common Parent [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of related party transaction | $ 120 | $ 120 | $ 120 |  |

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