v3.26.1
Financing Liabilities - Interest Rate Range and Payment Due Date for Financing Liabilities Presented in Non-current Liabilities (Including Reclassification to Current Liabilities) (Detail) - Non-current liabilities [member]
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Loans [member] | Bottom of range [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest rate 0.14% 0.14%
Payment due 2026 2025
Loans [member] | Top of range [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest rate 11.82% 13.30%
Payment due 2046 2046
Medium-term notes [member] | Bottom of range [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest rate 0.30% 0.30%
Payment due 2026 2025
Medium-term notes [member] | Top of range [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest rate 5.85% 5.85%
Payment due 2036 2035
Corporate bonds [member] | Bottom of range [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest rate 0.09% 0.09%
Payment due 2026 2025
Corporate bonds [member] | Top of range [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest rate 5.34% 2.97%
Payment due 2036 2032
Asset-backed securities [member] | Bottom of range [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest rate 0.36% 0.11%
Payment due 2026 2025
Asset-backed securities [member] | Top of range [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest rate 5.67% 5.87%
Payment due 2030 2029