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Segment Information (Reconciliation of Segment Totals to Consolidated Financial Statement Amounts) (Detail) - JPY (¥)
¥ in Millions
 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Segment revenues:    
Revenues ¥ 1,564,497 ¥ 1,403,633
Segment profits:    
Total profits for segments 242,878 196,972
Net income (loss) attributable to the noncontrolling interests and net income (loss) attributable to the redeemable noncontrolling interests (73) (156)
Income before Income Taxes 391,482 256,991
Operating Segment    
Segment revenues:    
Revenues 1,557,792 1,395,847
Segment profits:    
Total profits for segments 409,382 287,769
Corporate, Non-Segment    
Segment revenues:    
Revenues 43,292 34,620
Segment profits:    
Corporate profits (losses) (21,949) (30,109)
Net income (loss) attributable to the noncontrolling interests and net income (loss) attributable to the redeemable noncontrolling interests 4,049 (669)
Intersegment Eliminations    
Segment revenues:    
Revenues ¥ (36,587) ¥ (26,834)