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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

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