v3.26.1
Condensed Financial Information of Deswell Industries, Inc. - Schedule of Condensed Income Statement (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Schedule of Condensed Income Statement [Line Items]      
Income before income taxes $ 10,264 $ 11,300 $ 7,819
Income taxes 363 (162) (110)
Net income attribute to Deswell Industries, Inc. 10,627 11,138 7,709
Total comprehensive income attributable to Deswell Industries, Inc. 10,627 11,138 7,709
Parent Company [Member]      
Schedule of Condensed Income Statement [Line Items]      
Equity in earnings of subsidiaries 11,357 11,854 8,229
Operating expenses 730 716 520
Income before income taxes 10,627 11,138 7,709
Income taxes
Net income attribute to Deswell Industries, Inc. 10,627 11,138 7,709
Share of other comprehensive income of subsidiaries
Total comprehensive income attributable to Deswell Industries, Inc. $ 10,627 $ 11,138 $ 7,709