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Goodwill and Other Intangible Assets - Additional Information (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Intangible Assets by Major Class [Line Items]      
Impairment losses on goodwill ¥ 0 ¥ 0 ¥ 562
Aggregate amortization expenses for intangible assets 39,213 34,212 32,235
Estimated amortization expenses in fiscal 2025 39,066    
Estimated amortization expenses in fiscal 2026 34,108    
Estimated amortization expenses in fiscal 2027 32,021    
Estimated amortization expenses in fiscal 2028 26,415    
Estimated amortization expenses in fiscal 2029 25,322    
Intangible assets subject to amortization acquired 41,043    
Corporate Financial Services and Maintenance Leasing      
Intangible Assets by Major Class [Line Items]      
Impairment of intangible assets excluding goodwill   1 650
Real Estate Segment      
Intangible Assets by Major Class [Line Items]      
Impairment losses on goodwill 0 0 191
PE Investment and Concession Segment      
Intangible Assets by Major Class [Line Items]      
Impairment of intangible assets excluding goodwill 24    
ORIX USA      
Intangible Assets by Major Class [Line Items]      
Impairment losses on goodwill 0 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   405 259
Insurance [Member]      
Intangible Assets by Major Class [Line Items]      
Impairment losses on goodwill 0 0 371
ORIX Europe [Member]      
Intangible Assets by Major Class [Line Items]      
Impairment losses on goodwill 0 0 0
Impairment of intangible assets excluding goodwill     21,090
Asia and Australia      
Intangible Assets by Major Class [Line Items]      
Impairment losses on goodwill 0 ¥ 0 ¥ 0
Impairment of intangible assets excluding goodwill 37    
Software      
Intangible Assets by Major Class [Line Items]      
Intangible assets subject to amortization acquired ¥ 16,500    
Weighted average amortization period 7 years    
Customer relationships and others      
Intangible Assets by Major Class [Line Items]      
Intangible assets subject to amortization acquired ¥ 12,273    
Weighted average amortization period 16 years