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Segment Information (Geographical Revenues and Income before Income Taxes) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenues ¥ 2,874,821 ¥ 2,814,361 ¥ 2,663,659
Income before Income Taxes 480,463 469,975 392,178
Long-lived assets 3,078,423 2,931,251 2,576,446
Japan | Reportable Geographical Components      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenues 2,125,234 2,097,360 2,006,639
Income before Income Taxes 302,628 298,699 183,848
Long-lived assets 1,849,310 1,855,252 1,692,474
The Americas | Reportable Geographical Components      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenues [1] 270,100 263,090 258,792
Income before Income Taxes [1] 68,154 39,104 85,083
Long-lived assets [1] 43,124 34,661 34,553
Other Countries | Reportable Geographical Components      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenues [2] 479,487 453,911 398,228
Income before Income Taxes [2] 109,681 132,172 123,247
Long-lived assets [2] ¥ 1,185,989 ¥ 1,041,338 ¥ 849,419
[1] Mainly the United States
[2] Mainly Asia, Europe and Australasia