XML 108 R105.htm IDEA: XBRL DOCUMENT
v3.25.3

Selling, General and Administrative Expenses (Summary of Selling, General and Administrative Expenses) (Detail) - JPY (¥) ¥ in Millions | 6 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Selling, General and Administrative Expense [Abstract] |  |
Personnel expenses | ¥ 196,094 | ¥ 180,611
IT-related Expenses | ¥ 29,937 | ¥ 27,457

X
- Definition Personnel expenses. + References No definition available. + Details
Name: | ck0001070304_PersonnelExpenses
Namespace Prefix: | ck0001070304_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense in the period for communications and data processing expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_CommunicationsAndInformationTechnology
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SellingGeneralAndAdministrativeExpenseAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration