v3.26.1
Share-based Payments - Schedule of Fair Value of Stock Options Granted (Details)
12 Months Ended
Mar. 31, 2026
JPY (¥)
yr
¥ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Weighted average fair value | ¥ ¥ 1,998
Valuation method used Monte-Carlo simulation
Fair value of share on grant date ¥ 3,393
47th Stock Option  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Weighted average fair value | ¥ ¥ 488
Valuation method used Monte-Carlosimulation
Exercise price ¥ 1,300
Fair value of share on grant date ¥ 1,300
Exercise period | yr 10
Expected dividend yield 3.40%
Expected volatility 38.60%
Risk-free interest rate 1.30%
48th Stock Options  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Weighted average fair value | ¥ ¥ 409
Valuation method used Monte-Carlosimulation
Exercise price ¥ 1,300
Fair value of share on grant date ¥ 1,300
Exercise period | yr 10
Expected dividend yield 3.40%
Expected volatility 38.60%
Risk-free interest rate 1.30%
49th Stock Options  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Weighted average fair value | ¥ ¥ 472
Valuation method used Monte-Carlosimulation
Exercise price ¥ 1
Fair value of share on grant date ¥ 1,300
Exercise period | yr 20
Expected dividend yield 3.40%
Expected volatility 37.60%
Risk-free interest rate 2.10%