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Restatement of the March 31, 2023 Financial Statements - Narrative (Details) - Unappropriated retained earnings
¥ in Millions
12 Months Ended
Mar. 31, 2023
JPY (¥)
Error Corrections and Prior Period Adjustments Restatement [Line Items]  
Elimination of the difference in reporting periods of the transferred business (Note 2) ¥ 0
Adjustments  
Error Corrections and Prior Period Adjustments Restatement [Line Items]  
Elimination of the difference in reporting periods of the transferred business (Note 2) ¥ 223,273