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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Allowance for Credit Losses for Installment Loans (Detail) (Parenthetical) - JPY (¥) ¥ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for Credit Losses	¥ 5,604	¥ 1,426	¥ 8,524	¥ 1,674
Allowance for Credit Losses	69,046		69,046		¥ 64,723
Total charge-offs	11,225	4,014	14,706	11,840
Purchased loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total charge-offs	7,288	2,261	7,612	2,309
Purchased loans | Financial asset acquired with credit deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
Total charge-offs	¥ 7,261	¥ 2,067	¥ 7,580	¥ 2,095

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Accounts receivable and financing receivable allowance for credit loss.

+ References

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- Definition

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
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-Paragraph c
-Publisher SEC

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- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
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