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Significant Accounting and Reporting Policies - Additional Information (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Apr. 01, 2021
Significant Accounting Policies [Line Items]        
A maximum lag period of recognizing the results of subsidiaries and affiliates 3 months      
Residential condominiums under development ¥ 118,458 ¥ 74,621    
Finished goods 108,901 94,400    
Write-down on residential condominiums under development 2,308 1,205 ¥ 10,492  
Increase (decrease) in policy liability and policy account balances 1,892,510 1,832,057    
Increase (decrease) in impact of changes in policy liability discount rate 357,148 156,135    
Increase (decrease) in other operating assets 305,734 287,379 268,960  
Increase (decrease) in life insurance costs 433,863 373,906 363,569  
Increase (decrease) in retained earnings 3,259,730 3,054,448    
Installment loans 3,958,814 3,905,026    
Allowance for credit losses 58,110 65,373    
Investment in securities 3,263,079 2,852,378    
Income (loss) from equity method investments 36,774 22,081 24,565  
Gains on sales of subsidiaries and equity method investments and liquidation losses, net 72,488 33,000 191,999  
Revenues 2,814,361 2,663,659 2,508,043  
Equity method investments 1,313,887 1,062,410    
Other non cash income (expense) 40,233 121,941 99,222  
Proceeds from sales of equity method investments 23,967 104,387 54,629  
Other assets 2,068,768 2,057,828    
Revision of Prior Period, Adjustment        
Significant Accounting Policies [Line Items]        
Loans to affiliates   (27,424)    
Installment loans   27,424    
Allowance for credit losses on loans to affiliates   (650)    
Allowance for credit losses   650    
Investment in securities   (90,993)    
Equity method investments   90,993    
Proceeds from loan originations   (8,725) (4,311)  
Principal collected on installment loans   19,645 5,833  
Purchases of equity securities other than trading   (2,506)    
Investment in equity method of investment   4,340 8,887  
Accounting Standards Update 2023-02        
Significant Accounting Policies [Line Items]        
Increase (decrease) in retained earnings (200)      
Other assets ¥ (200)      
Accounting Standards Update 2018-12 | Revision of Prior Period, Adjustment        
Significant Accounting Policies [Line Items]        
Increase (decrease) in policy liability and policy account balances   (233,309) (50,925) ¥ 28,937
Increase (decrease) in impact of changes in policy liability discount rate   164,516 37,536 ¥ (24,641)
Increase (decrease) in other operating assets   23,194 10,012  
Increase (decrease) in life insurance costs   (25,010) (4,571)  
Increase (decrease) in retained earnings   22,506 5,241  
Investment in operating leases | Transportation equipment        
Significant Accounting Policies [Line Items]        
Estimated average useful lives 7 years      
Investment in operating leases | Measuring and information-related equipment        
Significant Accounting Policies [Line Items]        
Estimated average useful lives 4 years      
Investment in operating leases | Real Estate Other Than Land        
Significant Accounting Policies [Line Items]        
Estimated average useful lives 31 years      
Investment in operating leases | Other        
Significant Accounting Policies [Line Items]        
Estimated average useful lives 8 years      
Property under Facility Operations        
Significant Accounting Policies [Line Items]        
Depreciation expenses ¥ 35,615 34,622 29,871  
Accumulated depreciation 205,320 180,130    
Office Facilities        
Significant Accounting Policies [Line Items]        
Depreciation expenses 9,256 8,373 9,083  
Accumulated depreciation ¥ 84,364 74,507    
Provision for Loan | Revision of Prior Period, Adjustment        
Significant Accounting Policies [Line Items]        
Provision for credit losses   361 1,449  
Gain (Loss) on Investments | Revision of Prior Period, Adjustment        
Significant Accounting Policies [Line Items]        
Revenues   (1,505) 10,222  
Other Non-Cash Profit and Loss | Revision of Prior Period, Adjustment        
Significant Accounting Policies [Line Items]        
Income (loss) from equity method investments   1,505 (10,145)  
Gains on sales of subsidiaries and equity method investments and liquidation losses, net     (117)  
Other non cash income (expense)   (797) (782)  
Securities Investment | Revision of Prior Period, Adjustment        
Significant Accounting Policies [Line Items]        
Investment in affiliates   (2,511)    
Investment in securities   2,511    
Equity Method Investments | Revision of Prior Period, Adjustment        
Significant Accounting Policies [Line Items]        
Gains on sales of subsidiaries and equity method investments and liquidation losses, net   (6,085) (4,095)  
Revenues   1,866 2,112  
Provision for credit losses   361 1,449  
Payments to acquire equity method investments   (14,501) (12,969)  
Proceeds from sales of equity method investments   7,767 6,952  
Equity Method Investments | Gain (Loss) on Investments | Revision of Prior Period, Adjustment        
Significant Accounting Policies [Line Items]        
Revenues   ¥ 6,085 ¥ 4,212  
Minimum        
Significant Accounting Policies [Line Items]        
Income tax settlement by tax authority 50.00%      
Minimum | Investments in Partnerships and Other Investments        
Significant Accounting Policies [Line Items]        
Equity method investment, ownership percentage 3.00%      
Maximum | Property under Facility Operations | Buildings        
Significant Accounting Policies [Line Items]        
Estimated average useful lives 50 years      
Maximum | Property under Facility Operations | Structures        
Significant Accounting Policies [Line Items]        
Estimated average useful lives 60 years      
Maximum | Property under Facility Operations | Property, Plant and Equipment, Other Types        
Significant Accounting Policies [Line Items]        
Estimated average useful lives 44 years      
Maximum | Office Facilities | Buildings And Structures        
Significant Accounting Policies [Line Items]        
Estimated average useful lives 65 years      
Maximum | Office Facilities | Machinery and equipment        
Significant Accounting Policies [Line Items]        
Estimated average useful lives 46 years      
Maximum | Investments in Partnerships and Other Investments        
Significant Accounting Policies [Line Items]        
Equity method investment, ownership percentage 5.00%