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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Origination Years of Financial Assets (Detail) - JPY (¥)
¥ in Millions
 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2025
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) ¥ 129 ¥ 213  
One year ago (Gross write-offs) 497 1,091  
Two years ago (Gross write-offs) 1,312 1,269  
Three years ago (Gross write-offs) 821 2,721  
Four years ago (Gross write-offs) 172 426  
Prior (Gross write-offs) 5,459 778  
Total financing receivables 5,296,674   ¥ 5,105,469
Total financing receivables (Gross write-offs) 8,390 6,498  
Performing      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 943,707   1,673,007
One year ago 1,344,306   829,285
Two years ago 724,876   474,623
Three years ago 389,334   388,324
Four years ago 338,215   319,263
Prior 1,328,759   1,211,160
Total financing receivables 5,069,197   4,895,662
Non-Performing      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 770   5,356
One year ago 7,318   22,073
Two years ago 22,010   17,650
Three years ago 21,547   43,841
Four years ago 31,266   13,423
Prior 84,806   60,979
Total financing receivables 167,717   163,322
Consumer borrowers      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 9 213  
One year ago (Gross write-offs) 492 928  
Two years ago (Gross write-offs) 549 897  
Three years ago (Gross write-offs) 217 80  
Four years ago (Gross write-offs) 31 6  
Prior (Gross write-offs) 97 51  
Total financing receivables 2,108,053   2,067,900
Total financing receivables (Gross write-offs) 1,395 2,175  
Consumer borrowers | Real estate loans      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 0 0  
One year ago (Gross write-offs) 0 0  
Two years ago (Gross write-offs) 0 0  
Three years ago (Gross write-offs) 0 0  
Four years ago (Gross write-offs) 14 0  
Prior (Gross write-offs) 95 44  
Total financing receivables 2,001,575   1,956,816
Total financing receivables (Gross write-offs) 109 44  
Consumer borrowers | Other loans      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 9 213  
One year ago (Gross write-offs) 492 928  
Two years ago (Gross write-offs) 549 897  
Three years ago (Gross write-offs) 217 80  
Four years ago (Gross write-offs) 17 6  
Prior (Gross write-offs) 2 7  
Total financing receivables 40,719   43,210
Total financing receivables (Gross write-offs) 1,286 2,131  
Consumer borrowers | Performing      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 232,444   358,952
One year ago 302,791   154,694
Two years ago 144,579   159,847
Three years ago 148,640   143,281
Four years ago 136,272   227,594
Prior 1,056,898   936,220
Total financing receivables 2,021,624   1,980,588
Consumer borrowers | Performing | Real estate loans      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 221,468   339,308
One year ago 288,462   142,337
Two years ago 136,334   152,451
Three years ago 144,383   142,224
Four years ago 135,926   227,484
Prior 1,056,753   935,996
Total financing receivables 1,983,326   1,939,800
Consumer borrowers | Performing | Other loans      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 10,976   19,644
One year ago 14,329   12,357
Two years ago 8,245   7,396
Three years ago 4,257   1,057
Four years ago 346   110
Prior 145   224
Total financing receivables 38,298   40,788
Consumer borrowers | Non-Performing      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 101   586
One year ago 1,480   1,421
Two years ago 1,577   3,101
Three years ago 3,864   2,086
Four years ago 2,166   668
Prior 11,482   11,576
Total financing receivables 20,670   19,438
Consumer borrowers | Non-Performing | Real estate loans      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 18   224
One year ago 974   472
Two years ago 728   2,110
Three years ago 2,894   2,057
Four years ago 2,156   666
Prior 11,479   11,487
Total financing receivables 18,249   17,016
Consumer borrowers | Non-Performing | Other loans      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 83   362
One year ago 506   949
Two years ago 849   991
Three years ago 970   29
Four years ago 10   2
Prior 3   89
Total financing receivables 2,421   2,422
Corporate borrowers      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 120 0  
One year ago (Gross write-offs) 1 43  
Two years ago (Gross write-offs) 364 35  
Three years ago (Gross write-offs) 30 2,329  
Four years ago (Gross write-offs) 28 14  
Prior (Gross write-offs) 1,449 137  
Total financing receivables 1,850,367   1,738,136
Total financing receivables (Gross write-offs) 1,992 2,558  
Corporate borrowers | Non-recourse Loans | Japan      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 0    
One year ago (Gross write-offs) 0    
Two years ago (Gross write-offs) 0    
Three years ago (Gross write-offs) 0    
Four years ago (Gross write-offs) 0    
Prior (Gross write-offs) 0    
Total financing receivables 338,230   301,477
Total financing receivables (Gross write-offs) 0    
Corporate borrowers | Non-recourse Loans | The Americas      
Financing Receivable, Recorded Investment [Line Items]      
Total financing receivables     86,724
Corporate borrowers | Non-recourse Loans | Overseas      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 0    
One year ago (Gross write-offs) 0    
Two years ago (Gross write-offs) 0    
Three years ago (Gross write-offs) 0    
Four years ago (Gross write-offs) 0    
Prior (Gross write-offs) 0    
Total financing receivables 151,269    
Total financing receivables (Gross write-offs) 0    
Corporate borrowers | Other than non-recourse loans      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs)   0  
One year ago (Gross write-offs)   0  
Two years ago (Gross write-offs)   0  
Three years ago (Gross write-offs)   0  
Four years ago (Gross write-offs)   0  
Prior (Gross write-offs)   0  
Total financing receivables (Gross write-offs)   0  
Corporate borrowers | Real estate companies | Other than non-recourse loans | Japan      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 0    
One year ago (Gross write-offs) 0    
Two years ago (Gross write-offs) 0    
Three years ago (Gross write-offs) 0    
Four years ago (Gross write-offs) 0    
Prior (Gross write-offs) 0    
Total financing receivables 447,544   415,666
Total financing receivables (Gross write-offs) 0    
Corporate borrowers | Real estate companies | Other than non-recourse loans | Overseas      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 0    
One year ago (Gross write-offs) 0    
Two years ago (Gross write-offs) 0    
Three years ago (Gross write-offs) 0    
Four years ago (Gross write-offs) 0    
Prior (Gross write-offs) 0    
Total financing receivables 155,813   131,042
Total financing receivables (Gross write-offs) 0    
Corporate borrowers | Commercial, industrial and other companies | Other than non-recourse loans | Japan      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 0 0  
One year ago (Gross write-offs) 0 0  
Two years ago (Gross write-offs) 0 0  
Three years ago (Gross write-offs) 0 0  
Four years ago (Gross write-offs) 0 6  
Prior (Gross write-offs) 0 119  
Total financing receivables 215,988   225,900
Total financing receivables (Gross write-offs) 0 125  
Corporate borrowers | Commercial, industrial and other companies | Other than non-recourse loans | Overseas      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 120 0  
One year ago (Gross write-offs) 1 43  
Two years ago (Gross write-offs) 364 35  
Three years ago (Gross write-offs) 30 2,329  
Four years ago (Gross write-offs) 28 8  
Prior (Gross write-offs) 1,449 18  
Total financing receivables 541,523   577,327
Total financing receivables (Gross write-offs) 1,992 2,433  
Corporate borrowers | Performing      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 448,294   865,495
One year ago 651,816   246,134
Two years ago 209,508   133,623
Three years ago 107,715   154,928
Four years ago 135,985   42,744
Prior 171,906   175,757
Total financing receivables 1,725,224   1,618,681
Corporate borrowers | Performing | Non-recourse Loans | Japan      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 91,971   225,394
One year ago 186,801   52,292
Two years ago 40,113   10,487
Three years ago 9,680   6,932
Four years ago 6,815   0
Prior 2,850   6,372
Total financing receivables 338,230   301,477
Corporate borrowers | Performing | Non-recourse Loans | The Americas      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year     44,762
One year ago     20,079
Two years ago     7,540
Three years ago     886
Four years ago     135
Prior     9,491
Total financing receivables     82,893
Corporate borrowers | Performing | Non-recourse Loans | Overseas      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 49,699    
One year ago 48,826    
Two years ago 25,318    
Three years ago 11,242    
Four years ago 2,672    
Prior 4,186    
Total financing receivables 141,943    
Corporate borrowers | Performing | Real estate companies | Other than non-recourse loans | Japan      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 128,306   205,004
One year ago 135,748   67,092
Two years ago 54,828   33,558
Three years ago 27,430   23,295
Four years ago 21,423   19,072
Prior 79,263   67,088
Total financing receivables 446,998   415,109
Corporate borrowers | Performing | Real estate companies | Other than non-recourse loans | Overseas      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 19,033   57,678
One year ago 54,549   2,458
Two years ago 1,526   8,833
Three years ago 1,426   2,828
Four years ago 0   504
Prior 7,039   6,469
Total financing receivables 83,573   78,770
Corporate borrowers | Performing | Commercial, industrial and other companies | Other than non-recourse loans | Japan      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 61,020   131,439
One year ago 80,771   38,390
Two years ago 33,578   20,382
Three years ago 13,045   10,761
Four years ago 8,349   6,412
Prior 17,007   17,740
Total financing receivables 213,770   225,124
Corporate borrowers | Performing | Commercial, industrial and other companies | Other than non-recourse loans | Overseas      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 98,265   201,218
One year ago 145,121   65,823
Two years ago 54,145   52,823
Three years ago 44,892   110,226
Four years ago 96,726   16,621
Prior 61,561   68,597
Total financing receivables 500,710   515,308
Corporate borrowers | Non-Performing      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 131   2,389
One year ago 3,476   15,254
Two years ago 15,189   9,656
Three years ago 13,664   39,845
Four years ago 27,472   11,919
Prior 65,211   40,392
Total financing receivables 125,143   119,455
Corporate borrowers | Non-Performing | Non-recourse Loans | The Americas      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year     0
One year ago     0
Two years ago     67
Three years ago     0
Four years ago     0
Prior     3,764
Total financing receivables     3,831
Corporate borrowers | Non-Performing | Non-recourse Loans | Overseas      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 0    
One year ago 79    
Two years ago 225    
Three years ago 858    
Four years ago 1,078    
Prior 7,086    
Total financing receivables 9,326    
Corporate borrowers | Non-Performing | Real estate companies | Other than non-recourse loans | Japan      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 0   0
One year ago 0   0
Two years ago 0   0
Three years ago 5   0
Four years ago 0   8
Prior 541   549
Total financing receivables 546   557
Corporate borrowers | Non-Performing | Real estate companies | Other than non-recourse loans | Overseas      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 0   104
One year ago 0   6,964
Two years ago 10,149   6,586
Three years ago 9,814   8,013
Four years ago 13,074   4,326
Prior 39,203   26,279
Total financing receivables 72,240   52,272
Corporate borrowers | Non-Performing | Commercial, industrial and other companies | Other than non-recourse loans | Japan      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 0   415
One year ago 414   58
Two years ago 54   130
Three years ago 128   11
Four years ago 11   76
Prior 1,611   86
Total financing receivables 2,218   776
Corporate borrowers | Non-Performing | Commercial, industrial and other companies | Other than non-recourse loans | Overseas      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 131   1,870
One year ago 2,983   8,232
Two years ago 4,761   2,873
Three years ago 2,859   31,821
Four years ago 13,309   7,509
Prior 16,770   9,714
Total financing receivables 40,813   62,019
Loans to Equity Method Investees      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 0 0  
One year ago (Gross write-offs) 0 0  
Two years ago (Gross write-offs) 0 0  
Three years ago (Gross write-offs) 0 37  
Four years ago (Gross write-offs) 0 0  
Prior (Gross write-offs) 0 0  
Total financing receivables 137,585   132,053
Total financing receivables (Gross write-offs) 0 37  
Loans to Equity Method Investees | Performing      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 2,158   515
One year ago 524   111,724
Two years ago 116,475   2,028
Three years ago 2,018   0
Four years ago 20   1,583
Prior 15,046   14,858
Total financing receivables 136,241   130,708
Loans to Equity Method Investees | Non-Performing      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 1   0
One year ago 4   0
Two years ago 0   0
Three years ago 0   0
Four years ago 0   0
Prior 1,339   1,345
Total financing receivables 1,344   1,345
Purchased loans      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 0 0  
One year ago (Gross write-offs) 0 0  
Two years ago (Gross write-offs) 0 0  
Three years ago (Gross write-offs) 0 57  
Four years ago (Gross write-offs) 0 255  
Prior (Gross write-offs) 3,659 296  
Total financing receivables (Gross write-offs) 3,659 608  
Purchased loans | Performing      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 0   0
One year ago 0   52
Two years ago 0   14
Three years ago 0   476
Four years ago 0   86
Prior 5,786   19,497
Total financing receivables 5,786   20,125
Purchased loans | Non-Performing      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 0   0
One year ago 0   0
Two years ago 0   0
Three years ago 0   31
Four years ago 0   0
Prior 213   1,233
Total financing receivables 213   1,264
Net investment in leases      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 0 0  
One year ago (Gross write-offs) 4 120  
Two years ago (Gross write-offs) 399 337  
Three years ago (Gross write-offs) 574 218  
Four years ago (Gross write-offs) 113 151  
Prior (Gross write-offs) 254 294  
Total financing receivables 1,200,669   1,167,380
Total financing receivables (Gross write-offs) 1,344 1,120  
Net investment in leases | Japan      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 0 0  
One year ago (Gross write-offs) 2 3  
Two years ago (Gross write-offs) 39 49  
Three years ago (Gross write-offs) 117 97  
Four years ago (Gross write-offs) 93 122  
Prior (Gross write-offs) 238 250  
Total financing receivables 615,211   618,963
Total financing receivables (Gross write-offs) 489 521  
Net investment in leases | Overseas      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year (Gross write-offs) 0 0  
One year ago (Gross write-offs) 2 117  
Two years ago (Gross write-offs) 360 288  
Three years ago (Gross write-offs) 457 121  
Four years ago (Gross write-offs) 20 29  
Prior (Gross write-offs) 16 44  
Total financing receivables 585,458   548,417
Total financing receivables (Gross write-offs) 855 ¥ 599  
Net investment in leases | Performing      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 260,811   448,045
One year ago 389,175   316,681
Two years ago 254,314   179,111
Three years ago 130,961   89,639
Four years ago 65,938   47,256
Prior 79,123   64,828
Total financing receivables 1,180,322   1,145,560
Net investment in leases | Performing | Japan      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 100,754   199,069
One year ago 174,961   145,491
Two years ago 124,968   101,351
Three years ago 83,219   67,720
Four years ago 53,501   40,680
Prior 73,321   60,287
Total financing receivables 610,724   614,598
Net investment in leases | Performing | Overseas      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 160,057   248,976
One year ago 214,214   171,190
Two years ago 129,346   77,760
Three years ago 47,742   21,919
Four years ago 12,437   6,576
Prior 5,802   4,541
Total financing receivables 569,598   530,962
Net investment in leases | Non-Performing      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 537   2,381
One year ago 2,358   5,398
Two years ago 5,244   4,893
Three years ago 4,019   1,879
Four years ago 1,628   836
Prior 6,561   6,433
Total financing receivables 20,347   21,820
Net investment in leases | Non-Performing | Japan      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 31   160
One year ago 337   628
Two years ago 784   763
Three years ago 793   808
Four years ago 763   500
Prior 1,779   1,506
Total financing receivables 4,487   4,365
Net investment in leases | Non-Performing | Overseas      
Financing Receivable, Recorded Investment [Line Items]      
Current fiscal year 506   2,221
One year ago 2,021   4,770
Two years ago 4,460   4,130
Three years ago 3,226   1,071
Four years ago 865   336
Prior 4,782   4,927
Total financing receivables ¥ 15,860   ¥ 17,455