Goodwill and Other Intangible Assets [Line Items]

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- 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.

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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- Definition

Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

+ References

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- Definition

Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.

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Goodwill and Other Intangible Assets (Narrative) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Goodwill and Other Intangible Assets [Line Items]
Impairment losses on goodwill	¥ 150,089	¥ 0	¥ 33,553
Intangible assets subject to amortization acquired	403,938	386,626
Intangible assets not subject to amortization acquired	46	2
Impairment of intangible assets	14,353	15,042	5,151
Software
Goodwill and Other Intangible Assets [Line Items]
Intangible assets subject to amortization acquired	¥ 335,848	¥ 327,752
Weighted average amortization periods of intangible assets subject to amortization, years	6 years	6 years
Customer relationships
Goodwill and Other Intangible Assets [Line Items]
Intangible assets subject to amortization acquired	¥ 68,010	¥ 53,885
Weighted average amortization periods of intangible assets subject to amortization, years	16 years	13 years
Operating Segments \| Customer business \| Asset Management & Investor Services Business Group
Goodwill and Other Intangible Assets [Line Items]
Impairment losses on goodwill	¥ 117,701
Operating Segments \| Customer business \| Asset Management & Investor Services Business Group \| First Sentier Investors
Goodwill and Other Intangible Assets [Line Items]
Impairment losses on goodwill	109,933		¥ 33,553
Operating Segments \| Customer business \| Global Commercial Banking Business Group
Goodwill and Other Intangible Assets [Line Items]
Impairment losses on goodwill	32,388
Operating Segments \| Customer business \| Global Commercial Banking Business Group \| PT Mandala Multifinance Tbk
Goodwill and Other Intangible Assets [Line Items]
Impairment losses on goodwill	¥ 32,388