v3.26.1
Goodwill and intangible assets - Summary of Other Changes In Other Intangible Assets (Detail) - Other intangible assets [member] - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance ¥ 671,212 ¥ 615,602
Changes in carrying amount:    
Additions 123,604 180,008
Acquisitions through business combinations 139,548 41,788
Internal development 22,814 23,128
Disposals or classified as held for sale (11,229) (4,717)
Classified as held for distribution to owners (75,919)  
Amortization (160,630) (166,047)
Impairment losses (45,782) (10,350)
Translation adjustment 14,325 (3,586)
Other (18,365) (4,614)
Total changes (11,634) 55,610
Ending Balance 659,578 671,212
Patent rights, know-how and license agreements [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 25,370 19,918
Changes in carrying amount:    
Additions 3,718 4,121
Acquisitions through business combinations 7,415 8,433
Disposals or classified as held for sale (485) (8)
Classified as held for distribution to owners  
Amortization (8,029) (6,734)
Impairment losses (39) (10)
Translation adjustment 903 (406)
Other 3,494 56
Total changes 6,977 5,452
Ending Balance 32,347 25,370
Customer relationships [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 12,528 14,933
Changes in carrying amount:    
Additions 0 230
Acquisitions through business combinations 6,350 4,338
Disposals or classified as held for sale 0 (414)
Classified as held for distribution to owners  
Amortization (3,512) (6,485)
Impairment losses (2,078) 0
Translation adjustment 752 (74)
Other   0
Total changes 1,512 (2,405)
Ending Balance 14,040 12,528
Trademarks [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 40,730 39,620
Changes in carrying amount:    
Additions 8 825
Acquisitions through business combinations 123,058 6,288
Disposals or classified as held for sale (386) (1)
Classified as held for distribution to owners (5)  
Amortization (6,057) (5,547)
Impairment losses (14,073)  
Translation adjustment 2,154 (478)
Other 1 23
Total changes 104,700 1,110
Ending Balance 145,430 40,730
Software [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 457,718 409,990
Changes in carrying amount:    
Additions 118,603 169,476
Acquisitions through business combinations 88 4,698
Internal development 22,814 23,128
Disposals or classified as held for sale (10,161) (3,897)
Classified as held for distribution to owners (75,895)  
Amortization (122,884) (127,401)
Impairment losses (19,652) (10,337)
Translation adjustment 7,110 (1,567)
Other (19,133) (6,372)
Total changes (99,110) 47,728
Ending Balance 358,608 457,718
Television carriage contracts [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 20,791 25,447
Changes in carrying amount:    
Disposals or classified as held for sale (28) 0
Classified as held for distribution to owners  
Amortization (4,223) (4,324)
Translation adjustment 1,099 (358)
Other (1) 26
Total changes (3,153) (4,656)
Ending Balance 17,638 20,791
Other intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 114,075 105,694
Changes in carrying amount:    
Additions 1,275 5,356
Acquisitions through business combinations 2,637 18,031
Disposals or classified as held for sale (169) (397)
Classified as held for distribution to owners (19)  
Amortization (15,925) (15,556)
Impairment losses (9,940) (3)
Translation adjustment 2,307 (703)
Other (2,726) 1,653
Total changes (22,560) 8,381
Ending Balance 91,515 114,075
Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 2,017,703 1,825,767
Changes in carrying amount:    
Ending Balance 2,046,997 2,017,703
Gross carrying amount [member] | Patent rights, know-how and license agreements [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 216,960 212,000
Changes in carrying amount:    
Ending Balance 223,692 216,960
Gross carrying amount [member] | Customer relationships [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 73,654 70,560
Changes in carrying amount:    
Ending Balance 83,877 73,654
Gross carrying amount [member] | Trademarks [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 65,643 59,377
Changes in carrying amount:    
Ending Balance 192,613 65,643
Gross carrying amount [member] | Software [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 1,353,946 1,196,266
Changes in carrying amount:    
Ending Balance 1,240,309 1,353,946
Gross carrying amount [member] | Television carriage contracts [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 73,958 75,716
Changes in carrying amount:    
Ending Balance 77,479 73,958
Gross carrying amount [member] | Other intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 233,542 211,848
Changes in carrying amount:    
Ending Balance 229,027 233,542
Accumulated depreciation and impairment losses [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance (1,346,491) (1,210,165)
Changes in carrying amount:    
Ending Balance (1,387,419) (1,346,491)
Accumulated depreciation and impairment losses [member] | Patent rights, know-how and license agreements [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance (191,590) (192,082)
Changes in carrying amount:    
Ending Balance (191,345) (191,590)
Accumulated depreciation and impairment losses [member] | Customer relationships [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance (61,126) (55,627)
Changes in carrying amount:    
Ending Balance (69,837) (61,126)
Accumulated depreciation and impairment losses [member] | Trademarks [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance (24,913) (19,757)
Changes in carrying amount:    
Ending Balance (47,183) (24,913)
Accumulated depreciation and impairment losses [member] | Software [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance (896,228) (786,276)
Changes in carrying amount:    
Ending Balance (881,701) (896,228)
Accumulated depreciation and impairment losses [member] | Television carriage contracts [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance (53,167) (50,269)
Changes in carrying amount:    
Ending Balance (59,841) (53,167)
Accumulated depreciation and impairment losses [member] | Other intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance (119,467) (106,154)
Changes in carrying amount:    
Ending Balance ¥ (137,512) ¥ (119,467)