Business Combination, Acquired Receivables, Principal Outstanding

No definition available.

Name:	mufg_BusinessCombinationAcquiredReceivablesPrincipalOutstanding
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Balance Type:	debit
Period Type:	instant

- Definition

Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net Loans Receivables

+ References

No definition available.

+ Details

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Namespace Prefix:	mufg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Short-Term Debt

+ References

No definition available.

+ Details

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Namespace Prefix:	mufg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Disposal Group, Including Discontinued Operation, Deposits Payable

+ References

No definition available.

+ Details

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Namespace Prefix:	mufg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Disposal Group, Including Discontinued Operation, Interest Deposits In Other Banks

+ References

No definition available.

+ Details

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Namespace Prefix:	mufg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Disposal Group, Including Discontinued Operation, Investment Securities

+ References

No definition available.

+ Details

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Namespace Prefix:	mufg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Divestiture Of Business, Contingent Consideration, Asset

+ References

No definition available.

+ Details

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Namespace Prefix:	mufg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Divestiture Of Business, Contingent Consideration Period

+ References

No definition available.

+ Details

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Namespace Prefix:	mufg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Noncash or Part Noncash Proceeds From Diversiture Of Business, Noncash Financial or Equity Instrument Consideration, Shares

+ References

No definition available.

+ Details

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Namespace Prefix:	mufg_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Shares Acquired

+ References

No definition available.

+ Details

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Namespace Prefix:	mufg_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Ownership Percentage by Noncontrolling Owners

+ References

No definition available.

+ Details

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Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482665/350-30-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-Section 30
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480027/805-50-30-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount classified as assets attributable to disposal group held for sale or disposed of.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 10
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

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-Section 50
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-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479907/805-20-50-5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

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-SubTopic 10
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-Paragraph 2
-Subparagraph (c)
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-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References

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-Paragraph 1
-Subparagraph (b)(3)
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer.

+ References

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-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479907/805-20-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

+ References

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-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479907/805-20-50-1

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

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-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479405/805-10-25-23

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-Paragraph 8
-SubTopic 30
-Topic 805
-Publisher FASB
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-Section 30
-Paragraph 7
-SubTopic 30
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479637/805-30-30-7

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
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-Subparagraph (b)
-SubTopic 30
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479613/805-30-35-1

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of assets acquired at the acquisition date.

+ References

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-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479907/805-20-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of liabilities assumed at the acquisition date.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
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-Topic 230
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-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-4

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Reduction in cash due to no longer including the former subsidiary's cash in the consolidated entity's cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 45
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

+ References

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-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 3B
-Publisher FASB
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+ Details

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Period Type:	duration

- Definition

Amount before tax of income (loss) from operations classified as a discontinued operation. Excludes gain (loss) on disposal and provision for gain (loss) until its disposal.

+ References

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-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483475/205-20-45-3

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount classified as accounts, notes and loans receivable attributable to disposal group held for sale or disposed of.

+ References

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Balance Type:	debit
Period Type:	instant

- Definition

Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for purchase accounting adjustments.

+ References

No definition available.

+ Details

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Business Developments (Narrative) (Detail) - JPY (¥) ¥ in Millions							1 Months Ended		5 Months Ended	6 Months Ended	10 Months Ended	12 Months Ended
	Mar. 13, 2024	Nov. 14, 2023	Oct. 02, 2023	Jun. 01, 2023	Dec. 01, 2022	Nov. 30, 2022	Mar. 31, 2024	Aug. 31, 2023	Mar. 31, 2024	Mar. 31, 2024	Mar. 31, 2024	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Aug. 30, 2023
Business Developments [Line Items]
Gain on sale of MUFG Union Bank												¥ 0	¥ 349,442	¥ 0
Cash and cash equivalents					¥ 2,433,800
Net decrease in cash from sale of MUB												0	(1,711,764)	0
Goodwill							¥ 490,344		¥ 490,344	¥ 490,344	¥ 490,344	¥ 490,344	296,772	303,611
Customer relationships
Business Developments [Line Items]
Weighted average amortization period, in years												13 years
HC Philippines
Business Developments [Line Items]
Percentage of voting interests acquired				100.00%
Payment in cash				¥ 69,841
Assets acquired				137,577
Net loans receivables acquired				108,359
Liabilities acquired				96,152
Long-term debt liabilities acquired				43,891
Goodwill				28,196
Intangible assets				¥ 9,373
Weighted average amortization period, in years				5 years 8 months 12 days
Revenues											38,584
Earnings or loss of acquiree since acquisition date											¥ 2,547
Acquired loan at fair value at acquisition date				¥ 104,391
Acquired loan unpaid principal balance				109,032
Contractual loans not expected to be collected				4,100
Finite-lived intangible assets, purchase accounting adjustments												¥ 1,641	1,523
HC Philippines \| Customer relationships
Business Developments [Line Items]
Intangible assets				¥ 6,137
Weighted average amortization period, in years				7 years 6 months
HC Indonesia
Business Developments [Line Items]
Assets acquired			¥ 44,178
Short term borrowings acquired			22,299
Net loans receivables acquired			24,949
Liabilities acquired			30,494
Goodwill			18,034
Intangible assets			¥ 3,964
Weighted average amortization period, in years			6 years 10 months 24 days
Revenues										6,978
Earnings or loss of acquiree since acquisition date										¥ 345
Acquired loan at fair value at acquisition date			¥ 25,768
Acquired loan unpaid principal balance			27,389
Contractual loans not expected to be collected			¥ 1,505
Finite-lived intangible assets, purchase accounting adjustments												567	527
HC Indonesia \| Customer relationships
Business Developments [Line Items]
Intangible assets				¥ 3,582
Weighted average amortization period, in years				7 years 1 month 6 days
PT Mandala Multifinance Tbk
Business Developments [Line Items]
Percentage of voting interests acquired	70.60%
Payment in cash	¥ 59,025
Assets acquired	80,236
Net loans receivables acquired	47,937
Liabilities acquired	34,676
Long-term debt liabilities acquired	28,319
Goodwill	31,795
Intangible assets	¥ 15,139
Weighted average amortization period, in years	5 years 3 months 18 days
Noncontrolling interests, recorded on acquisition	¥ 10,448
Finite-lived intangible assets, purchase accounting adjustments												2,748	2,630
PT Mandala Multifinance Tbk \| Dealer relationships
Business Developments [Line Items]
Intangible assets	¥ 10,602
Weighted average amortization period, in years	8 years
Albacore Capital Group
Business Developments [Line Items]
Percentage of voting interests acquired		75.00%
Consideration transferred		¥ 49,266
Assets acquired		33,583
Liabilities acquired		12,187
Goodwill		63,063
Intangible assets		¥ 23,709
Weighted average amortization period, in years		15 years 8 months 12 days
Revenues									1,107
Earnings or loss of acquiree since acquisition date									¥ 155
Noncontrolling interests, recorded on acquisition		¥ 17,214
Acquisition related costs												2,599
Finite-lived intangible assets, purchase accounting adjustments												1,426	1,390
Contingent consideration		17,979
Cash and bank deposits acquired		6,448
Deferred tax liabilities acquired		5,927
Albacore Capital Group \| Customer relationships
Business Developments [Line Items]
Intangible assets		¥ 22,478
Weighted average amortization period, in years		16 years
HC Consumer Finance Philippines and PT Home Credit Indonesia
Business Developments [Line Items]
Acquisition related costs												¥ 1,044
Shares of U.S. Bancorp common stock received
Business Developments [Line Items]
Noncash or part noncash divestiture, consideration received					¥ 276,100								276,099
Non-interest bearing note receivable from U.S. Bancorp
Business Developments [Line Items]
Noncash or part noncash divestiture, consideration received													396,601
MUFG Union Bank \| HC Philippines
Business Developments [Line Items]
Percentage of voting interests acquired				25.00%
Krungsri \| HC Philippines
Business Developments [Line Items]
Percentage of voting interests acquired				75.00%
Krungsri \| HC Indonesia
Business Developments [Line Items]
Percentage of voting interests acquired			75.00%
Consideration transferred							¥ 4,896
Equity interest in acquiree, including subsequent acquisition,							80.00%		80.00%	80.00%	80.00%	80.00%
MUFG Bank and ADMF \| PT Mandala Multifinance Tbk
Business Developments [Line Items]
Percentage of voting interests acquired	80.60%
PT Adira Dinamika Multi Finance Tbk \| HC Indonesia
Business Developments [Line Items]
Percentage of voting interests acquired			9.80%
PT Adira Dinamika Multi Finance Tbk \| PT Mandala Multifinance Tbk
Business Developments [Line Items]
Acquired loan at fair value at acquisition date	¥ 42,152
Acquired loan unpaid principal balance	42,633
Contractual loans not expected to be collected	1,450
Payments to acquire investments	¥ 8,360
Krungsri and PT Adira Dinamika Multi Finance Tbk \| HC Indonesia
Business Developments [Line Items]
Percentage of voting interests acquired			84.80%
Payment in cash			¥ 31,812
MUAH \| MUFG Union Bank
Business Developments [Line Items]
Contingent consideration period															5 years
Dividends paid						¥ 636,800
U.S. Bancorp
Business Developments [Line Items]
Ownership percentage by NCI					3.00%			4.39%
U.S. Bancorp \| MUFG Union Bank
Business Developments [Line Items]
Number of shares acquired								24,000,000
Consideration transferred								¥ 136,800
HC Indonesia \| PT Adira Dinamika Multi Finance Tbk
Business Developments [Line Items]
Ownership percentage by NCI owners							4.90%		4.90%	4.90%	4.90%	4.90%
PT Mandala Multifinance Tbk \| PT Adira Dinamika Multi Finance Tbk
Business Developments [Line Items]
Ownership percentage by NCI owners	10.00%
Disposal group, disposed of by sale, not discontinued operations \| MUFG Union Bank
Business Developments [Line Items]
Impairment of assets held for sale													134,141
Proceeds from divestiture of businesses					¥ 754,000
Contingent consideration receivable													¥ 464,500
Contingent consideration period													5 years
Gain on sale of MUFG Union Bank					349,400
Assets held for sale					13,935,600
Interest-earning deposits in other banks					2,251,300
Investment securities					3,123,300
Loans					7,567,700
Liabilities held for sale					13,128,000
Deposits payable					¥ 11,789,900
Loss from discontinued operation before income tax													¥ 506,329	¥ 11,385
Disposal group, disposed of by sale, not discontinued operations \| MUFG Union Bank \| U.S. Bancorp
Business Developments [Line Items]
Noncash proceeds (in shares)					44,374,155