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Significant Accounting and Reporting Policies - Additional Information (Detail) - JPY (¥) ¥ in Millions	6 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025
Significant Accounting Policies [Line Items]
A maximum lag period of recognizing the results of subsidiaries and affiliates	3 months
Residential condominiums under development	¥ 122,566		¥ 116,416
Finished goods	¥ 117,811		112,813
Effective tax rate	29.80%	29.10%
National corporation tax	24.00%	24.00%
Inhabitant tax	2.00%	2.00%
Statutory income tax rate	31.50%	31.50%
Deductible enterprise tax	5.00%	5.00%
Loans held for sale in installment loans	¥ 95,050		111,527
Goodwill acquired	783,996		621,858
Other intangible assets	551,157		525,411
Aggregate loan fair value	85,724		97,694
Investment in operating leases
Significant Accounting Policies [Line Items]
Accumulated depreciation of Investment in operating leases	981,454		946,341
Property under Facility Operations
Significant Accounting Policies [Line Items]
Accumulated depreciation	245,560		238,185
Office Facilities
Significant Accounting Policies [Line Items]
Accumulated depreciation	¥ 67,666		¥ 65,155

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Accumulated depreciation of investment in operating leases.

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Corporate inhabitan tax rate.

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Maximum Lag Period of Recognizing the Results of Subsidiaries and Affiliates

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National corporate tax rate.

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Significant Accounting Policies [Line Items]

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount, after accumulated impairment loss, of 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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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Cost of real estate projects incurred for projects for eventual sale or transfer (condominium or time share projects, vacation clubs).

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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