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Goodwill and Other Intangible Assets - Additional Information (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Intangible Assets by Major Class [Line Items]      
Impairment losses on goodwill ¥ 6,695 ¥ 0 ¥ 0
Aggregate amortization expenses for intangible assets 41,402 39,213 34,212
Estimated amortization expenses in fiscal 2026 38,480    
Estimated amortization expenses in fiscal 2027 35,214    
Estimated amortization expenses in fiscal 2028 31,995    
Estimated amortization expenses in fiscal 2029 27,850    
Estimated amortization expenses in fiscal 2030 24,573    
Intangible assets subject to amortization acquired ¥ 79,869    
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, General and Administrative Expense    
Corporate Financial Services and Maintenance Leasing      
Intangible Assets by Major Class [Line Items]      
Impairment of intangible assets excluding goodwill     1
PE Investment and Concession Segment      
Intangible Assets by Major Class [Line Items]      
Impairment of intangible assets excluding goodwill ¥ 5,629 24  
ORIX USA      
Intangible Assets by Major Class [Line Items]      
Impairment losses on goodwill 1,175 0 0
Impairment of intangible assets excluding goodwill     110
Environment and Energy      
Intangible Assets by Major Class [Line Items]      
Impairment losses on goodwill 0 0 0
Impairment of intangible assets excluding goodwill   87  
Aircraft and Ships      
Intangible Assets by Major Class [Line Items]      
Impairment losses on goodwill 0 0 0
Impairment of intangible assets excluding goodwill     405
ORIX Europe      
Intangible Assets by Major Class [Line Items]      
Impairment losses on goodwill 0 0 0
Impairment of intangible assets excluding goodwill 1,971    
Asia and Australia      
Intangible Assets by Major Class [Line Items]      
Impairment losses on goodwill 0 0 0
Impairment of intangible assets excluding goodwill   37  
PE Investment And Concession [Member]      
Intangible Assets by Major Class [Line Items]      
Impairment losses on goodwill 5,520 0 0
Impairment of intangible assets excluding goodwill 148    
Banking and Credit [Member]      
Intangible Assets by Major Class [Line Items]      
Impairment losses on goodwill 0 ¥ 0 ¥ 0
Impairment of intangible assets excluding goodwill 84    
Software      
Intangible Assets by Major Class [Line Items]      
Intangible assets subject to amortization acquired ¥ 12,672    
Weighted average amortization period 5 years    
Customer relationships and others      
Intangible Assets by Major Class [Line Items]      
Intangible assets subject to amortization acquired ¥ 21,684    
Weighted average amortization period 17 years    
Maintenance intangible assets      
Intangible Assets by Major Class [Line Items]      
Intangible assets subject to amortization acquired ¥ 45,445    
Weighted average amortization period 6 years