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Acquisitions and Divestitures - Additional Information (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition [Line Items]        
Acquisitions consideration, cost of acquired entity paid in cash ¥ 190,119 ¥ 148,483 ¥ 71,840  
Goodwill acquired 443,818 430,679 368,625 ¥ 341,178
Bargain Purchase Gain 955 0 0  
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net 74,001 33,314 49,203  
Property under Facility Operations 562,485 441,632    
Other Liabilities 912,921 617,746    
Overseas Business Segment        
Business Acquisition [Line Items]        
Goodwill acquired 251,804 245,058 203,106 177,761
Investment and Operation Segment        
Business Acquisition [Line Items]        
Goodwill acquired 93,711 89,178 61,575 68,814
Corporate Financial Services        
Business Acquisition [Line Items]        
Goodwill acquired 56,665 55,366 55,366 55,366
Bargain Purchase Gain   955    
Real Estate Segment        
Business Acquisition [Line Items]        
Goodwill acquired 16,272 16,383 23,614 ¥ 23,531
Series of Individually Immaterial Business Acquisitions        
Business Acquisition [Line Items]        
Goodwill acquired 46,522 72,466 42,933  
Acquired intangible assets other than goodwill 20,437 15,991 40,008  
Divestiture        
Business Acquisition [Line Items]        
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net 74,001 33,314 49,203  
Divestiture | Overseas Business Segment        
Business Acquisition [Line Items]        
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net 39,663 23,513 15,408  
Divestiture | Investment and Operation Segment        
Business Acquisition [Line Items]        
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net 17,995   30,176  
Divestiture | Corporate Financial Services        
Business Acquisition [Line Items]        
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net     2,028  
Divestiture | Real Estate Segment        
Business Acquisition [Line Items]        
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net ¥ 16,223 8,025 ¥ 1,604  
Property under Facility Operations   42,595    
Other Liabilities   23,078    
Divestiture | Maintenance Leasing Segment        
Business Acquisition [Line Items]        
Gains on Sales of Subsidiaries and Affiliates and Liquidation Losses, net   ¥ 1,220