Related Party Transactions - Summary of Significant Balances and Transactions Between Group and Related Parties Financial Transactions (Details) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure of transactions between related parties [line items] | |||
| Interest amounts | ¥ 10,590 | ¥ 4,254 | ¥ 1,931 |
| Interest amounts | 116,488 | 88,442 | 73,884 |
| Parent Company | LY Corporation | Loan Payables and Interest Expenses | |||
| Disclosure of transactions between related parties [line items] | |||
| Interest amounts | 278 | 493 | 502 |
| Outstanding payable balances | ¥ (20,035) | ¥ (50,052) | (95,100) |
| Parent Company | LY Corporation | Deposits and Interest Received | |||
| Disclosure of transactions between related parties [line items] | |||
| Interest amounts | 428 | ||
| Outstanding receivable balances | ¥ 0 | ||
| X | ||||||||||
- Definition The amounts payable resulting from related party transactions. [Refer: Total for all related parties [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The amounts receivable resulting from related party transactions. [Refer: Total for all related parties [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. No definition available.
|
| X | ||||||||||
- Definition The amount of expense arising from interest. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The amount of income arising from interest. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|