v3.26.1
Income Taxes - Summary of Reconciliation of Statutory Tax Rate and Effective Income Tax Rate (Detail)
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Statements [Line Items]      
Statutory tax rate 30.90% 30.90% 30.90%
Increase (reduction) in taxes resulting from:      
Non-deductible expenses 0.80% 0.80% 0.30%
Tax-exempt income (0.30%) (0.60%) (0.20%)
Deferred tax liabilities on undistributed earnings of foreign subsidiaries 1.00% 1.00% 0.60%
Effects of investments accounted for using the equity method (3.30%) (2.80%) (3.40%)
Deferred tax liabilities on undistributed earnings of associates and joint ventures 2.10% 1.90% 2.10%
Change in unrecognized deferred tax assets 3.80% 2.10% 0.40%
Tax credits (4.60%) (4.20%) (2.10%)
The difference between the statutory tax rate in Japan and that of foreign subsidiaries (3.10%) (3.10%) (2.00%)
Unrecognized tax benefits adjustments (5.40%) (1.10%) 0.00%
Revision to deferred tax assets and liabilities at the fiscal year-end due to changes in tax rates 0.00% 0.40% 0.00%
Other 0.70% 0.00% 0.60%
Average effective tax rate 22.70% 25.30% 27.20%