Shareholders' Equity - Additional Information (Detail) ¥ in Millions |
12 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
May 31, 2026
JPY (¥)
shares
|
May 13, 2026
JPY (¥)
shares
|
Jan. 31, 2026
JPY (¥)
shares
|
Jul. 31, 2025
JPY (¥)
shares
|
May 14, 2025
JPY (¥)
shares
|
Jan. 31, 2025
JPY (¥)
shares
|
Jul. 31, 2024
JPY (¥)
shares
|
May 15, 2024
JPY (¥)
shares
|
Mar. 22, 2024
JPY (¥)
shares
|
Mar. 31, 2026
JPY (¥)
shares
|
Mar. 31, 2025
JPY (¥)
shares
|
Mar. 31, 2024
JPY (¥)
|
Nov. 14, 2025
JPY (¥)
shares
|
Nov. 14, 2024
JPY (¥)
shares
|
Nov. 14, 2023
JPY (¥)
shares
|
|
| Purchase of treasury stock | ¥ | ¥ 250,625 | ¥ 251,629 | ¥ 211,434 | ||||||||||||
| Total amount the company can pay out as a dividend | ¥ | ¥ 2,555,000 | ||||||||||||||
| Number of share acquired in share based payment arrangement | 153,000 | 149,000 | |||||||||||||
| Common stock [member] | |||||||||||||||
| Number of authorized shares | 9,000,000,000 | 9,000,000,000 | |||||||||||||
| Share repurchase program [member] | |||||||||||||||
| Shares authorized to be repurchased amount | ¥ | ¥ 180,000 | ¥ 100,000 | ¥ 100,000 | ¥ 150,000 | ¥ 150,000 | ¥ 150,000 | |||||||||
| Number of shares repurchased | 29,909,500 | 27,551,100 | 40,086,100 | 9,561,800 | 20,132,000 | ||||||||||
| Purchase of treasury stock | ¥ | ¥ 150,000 | ¥ 100,000 | ¥ 150,000 | ¥ 100,000 | ¥ 150,000 | ||||||||||
| Shares authorized to be repurchased, shares | 40,000,000 | 40,000,000 | 15,000,000 | 50,000,000 | 60,000,000 | 26,000,000 | |||||||||
| Shares repurchased during period shares | 5,439,500 | ||||||||||||||
| Shares repurchased during period value | ¥ | ¥ 32,000 | ||||||||||||||
| Major ordinary share transactions [member] | |||||||||||||||
| Number of share acquired in share based payment arrangement | 1,094,000 | ||||||||||||||
| Stockholder equity stock split ratio | 2 | 3 | |||||||||||||