v3.25.2
Leases - Summary of ROU Assets (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount, beginning balance ¥ 503,395 ¥ 478,063
Changes in the carrying amount    
Increase due to new lease agreements and remeasurement of lease liabilities 114,818 98,394
Decrease due to termination of lease agreements and remeasurement of lease liabilities (14,953) (10,937)
Depreciation (102,032) (94,842)
Other 20,457 32,717
Total changes 18,290 25,332
Carrying amount, ending balance 521,685 503,395
Land [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount, beginning balance 14,815 15,238
Changes in the carrying amount    
Increase due to new lease agreements and remeasurement of lease liabilities 6,104 177
Decrease due to termination of lease agreements and remeasurement of lease liabilities (4) (74)
Depreciation (1,342) (1,169)
Other (288) 643
Total changes 4,470 (423)
Carrying amount, ending balance 19,285 14,815
Buildings [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount, beginning balance 424,508 413,063
Changes in the carrying amount    
Increase due to new lease agreements and remeasurement of lease liabilities 102,348 73,038
Decrease due to termination of lease agreements and remeasurement of lease liabilities (13,615) (10,396)
Depreciation (87,916) (82,576)
Other 20,928 31,379
Total changes 21,745 11,445
Carrying amount, ending balance 446,253 424,508
Machinery and equipment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount, beginning balance 64,072 49,762
Changes in the carrying amount    
Increase due to new lease agreements and remeasurement of lease liabilities 6,366 25,179
Decrease due to termination of lease agreements and remeasurement of lease liabilities (1,334) (467)
Depreciation (12,774) (11,097)
Other (183) 695
Total changes (7,925) 14,310
Carrying amount, ending balance ¥ 56,147 ¥ 64,072