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Segment Information (Geographical Revenues and Income before Income Taxes) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]      
Total Revenues ¥ 2,814,361 ¥ 2,663,659 ¥ 2,508,043
Income before Income Taxes 469,975 392,178 509,447
Japan | Reportable Geographical Components      
Segment Reporting Information [Line Items]      
Total Revenues 2,097,360 2,006,639 1,943,954
Income before Income Taxes 359,520 219,720 326,799
The Americas | Reportable Geographical Components      
Segment Reporting Information [Line Items]      
Total Revenues [1] 263,090 258,792 232,487
Income before Income Taxes [1] 25,947 73,179 94,759
Other Countries | Reportable Geographical Components      
Segment Reporting Information [Line Items]      
Total Revenues [2] 453,911 398,228 331,602
Income before Income Taxes [2] ¥ 84,508 ¥ 99,279 ¥ 87,889
[1] Mainly the United States
[2] Mainly Asia, Europe, Australasia and Middle East