v3.26.1
Segment and geographic information - Geographic allocation of Net revenue and Income (loss) before income taxes from operations by geographic areas, and Long-lived assets (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Net revenue, income (loss) before income taxes and long-lived assets      
Consolidated, Net revenue [1] ¥ 2,167,713 ¥ 1,892,485 ¥ 1,562,000
Consolidated, Income (loss) before income taxes 539,821 471,964 273,850
Consolidated, Long-lived assets 848,643 469,176 488,440
Americas [Member]      
Net revenue, income (loss) before income taxes and long-lived assets      
Consolidated, Net revenue [1] 669,998 589,122 453,069
Consolidated, Income (loss) before income taxes 61,868 65,753 14,650
Consolidated, Long-lived assets 385,825 111,312 121,633
Europe [Member]      
Net revenue, income (loss) before income taxes and long-lived assets      
Consolidated, Net revenue [1] 261,522 375,648 269,292
Consolidated, Income (loss) before income taxes (31,128) 20,348 (33,064)
Consolidated, Long-lived assets 58,555 55,515 62,063
Asia and Oceania [Member]      
Net revenue, income (loss) before income taxes and long-lived assets      
Consolidated, Net revenue [1] 148,415 61,730 56,684
Consolidated, Income (loss) before income taxes 60,790 50,878 23,795
Consolidated, Long-lived assets 41,112 31,656 33,820
Subtotal [Member]      
Net revenue, income (loss) before income taxes and long-lived assets      
Consolidated, Net revenue [1] 1,079,935 1,026,500 779,045
Consolidated, Income (loss) before income taxes 91,530 136,979 5,381
Consolidated, Long-lived assets 485,492 198,483 217,516
Japan [Member]      
Net revenue, income (loss) before income taxes and long-lived assets      
Consolidated, Net revenue [1] 1,087,778 865,985 782,955
Consolidated, Income (loss) before income taxes 448,291 334,985 268,469
Consolidated, Long-lived assets ¥ 363,151 ¥ 270,693 ¥ 270,924
[1] There is no revenue derived from transactions with a single major external customer.