v3.26.1
Segment Information (Geographical Revenues and Income before Income Taxes) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenues ¥ 3,330,831 ¥ 2,874,821 ¥ 2,814,361
Income before Income Taxes 691,431 480,463 469,975
Long-lived assets 3,309,012 3,078,423 2,931,251
Japan | Reportable Geographical Components      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenues 2,423,388 2,125,234 2,097,360
Income before Income Taxes 442,322 302,628 298,699
Long-lived assets 1,961,020 1,849,310 1,855,252
The Americas | Reportable Geographical Components      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenues [1] 405,209 270,100 263,090
Income before Income Taxes [1] 35,156 68,154 39,104
Long-lived assets [1] 70,896 43,124 34,661
Other Countries | Reportable Geographical Components      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenues [2] 502,234 479,487 453,911
Income before Income Taxes [2] 213,953 109,681 132,172
Long-lived assets [2] ¥ 1,277,096 ¥ 1,185,989 ¥ 1,041,338
[1] Mainly the United States
[2] Mainly Asia, Europe and Australasia