Financial instruments - Summary of Significant Marketable Equity Instruments Measured at Fair Value Through Other Comprehensive Income (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2025 |
Mar. 31, 2024 |
|---|---|---|
| Bilibili Inc [Member] | ||
| Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] | ||
| Marketable equity instruments measured at fair value through other comprehensive income | ¥ 0 | ¥ 29,410 |
| ANYCOLOR Inc. [Member] | ||
| Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] | ||
| Marketable equity instruments measured at fair value through other comprehensive income | 10,815 | 8,568 |
| KADOKAWA Corporation [Member] | ||
| Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] | ||
| Marketable equity instruments measured at fair value through other comprehensive income | ¥ 52,951 | ¥ 7,545 |