v3.26.1
Stockholders' equity - Summary of Analysis of Other Comprehensive Income by Item (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Changes in equity instruments measured at fair value through other comprehensive income      
Amount incurred during the year ¥ (27,915) ¥ (15,131) ¥ (72,245)
Total before tax (27,915) (15,131) (72,245)
Tax expense or (benefit) 6,514 3,598 17,418
Net of tax (21,401) (11,533) (54,827)
Remeasurement of defined benefit pension plans      
Amount incurred during the year 51,235 15,865 38,875
Total before tax 51,235 15,865 38,875
Tax expense or (benefit) (13,014) (4,838) (11,831)
Net of tax 38,221 11,027 27,044
Share of other comprehensive income of investments accounted for using the equity method      
Amount incurred during the year 297 (1,287) 704
Total before tax 297 (1,287) 704
Tax expense or (benefit) (54) 376 (91)
Net of tax 243 (911) 613
Other comprehensive income from discontinued operations      
Amount incurred during the year 1,239 (2,208) (243)
Total before tax 1,239 (2,208) (243)
Tax expense or (benefit) (382) 766 87
Net of tax 857 (1,442) (156)
Total 17,920 (2,859) (27,326)
Cash flow hedges      
Amount incurred during the year (7,416) (5,384) (15,032)
Reclassification to profit or loss 2,829 433 16,982
Total before tax (4,587) (4,951) 1,950
Tax expense or (benefit) 1,203 656 (598)
Net of tax (3,384) (4,295) 1,352
Exchange differences on translating foreign operations      
Amount incurred during the year 415,503 (78,193) 441,943
Reclassification to profit or loss 8,857 (1,073) 463
Total before tax 424,360 (79,266) 442,406
Tax expense or (benefit) 0    
Net of tax 424,360 (79,266) 442,406
Share of other comprehensive income of investments accounted for using the equity method      
Amount incurred during the year (23,378) (337) 4,735
Reclassification to profit or loss 358    
Total before tax (23,020) (337) 4,735
Tax expense or (benefit) 1,738    
Net of tax (21,282) (337) 4,735
Other comprehensive income from discontinued operations      
Amount incurred during the year (59,771) (188,264) (191,775)
Reclassification to profit or loss 1,451,335 4,537 (4,713)
Total before tax 1,391,564 (183,727) (196,488)
Tax expense or (benefit) 16,343 69,827 54,965
Net of tax 1,407,907 (113,900) (141,523)
Total 1,807,601 (197,798) 306,970
Total other comprehensive income, net of tax ¥ 1,825,521 ¥ (200,657) ¥ 279,644