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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 | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year (Gross write-offs) | ¥ 271 | ¥ 2,547
One year ago (Gross write-offs) | 2,410 | 4,201
Two years ago (Gross write-offs) | 2,293 | 3,061
Three years ago (Gross write-offs) | 3,225 | 909
Four years ago (Gross write-offs) | 640 | 2,048
Prior (Gross write-offs) | 10,189 | 49,509
Total financing receivables | 5,105,469 | 4,947,258
Total financing receivables (Gross write-offs) | 19,028 | 62,275
Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 1,673,007 | 1,339,364
One year ago | 829,285 | 756,782
Two years ago | 474,623 | 674,995
Three years ago | 388,324 | 429,232
Four years ago | 319,263 | 516,849
Prior | 1,211,160 | 1,068,275
Total financing receivables | 4,895,662 | 4,785,497
Non-Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 5,356 | 10,689
One year ago | 22,073 | 9,691
Two years ago | 17,650 | 30,587
Three years ago | 43,841 | 7,076
Four years ago | 13,423 | 8,573
Prior | 60,979 | 42,765
Total financing receivables | 163,322 | 109,381
Consumer borrowers |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year (Gross write-offs) | 206 | 1,268
One year ago (Gross write-offs) | 1,773 | 3,500
Two years ago (Gross write-offs) | 1,136 | 988
Three years ago (Gross write-offs) | 106 | 228
Four years ago (Gross write-offs) | 8 | 147
Prior (Gross write-offs) | 70 | 685
Total financing receivables | 2,067,900 | 2,070,449
Total financing receivables (Gross write-offs) | 3,299 | 6,816
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 | 1
Two years ago (Gross write-offs) | 0 | 0
Three years ago (Gross write-offs) | 0 | 2
Four years ago (Gross write-offs) | 0 | 5
Prior (Gross write-offs) | 62 | 216
Total financing receivables | 1,956,816 | 1,947,461
Total financing receivables (Gross write-offs) | 62 | 224
Consumer borrowers | Other loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year (Gross write-offs) | 206 | 1,268
One year ago (Gross write-offs) | 1,773 | 3,499
Two years ago (Gross write-offs) | 1,136 | 988
Three years ago (Gross write-offs) | 106 | 226
Four years ago (Gross write-offs) | 8 | 142
Prior (Gross write-offs) | 8 | 469
Total financing receivables | 43,210 | 50,635
Total financing receivables (Gross write-offs) | 3,237 | 6,592
Consumer borrowers | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 358,952 | 245,106
One year ago | 154,694 | 200,373
Two years ago | 159,847 | 165,337
Three years ago | 143,281 | 248,395
Four years ago | 227,594 | 334,364
Prior | 936,220 | 788,888
Total financing receivables | 1,980,588 | 1,982,463
Consumer borrowers | Performing | Real estate loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 339,308 | 219,407
One year ago | 142,337 | 182,697
Two years ago | 152,451 | 161,632
Three years ago | 142,224 | 247,905
Four years ago | 227,484 | 334,009
Prior | 935,996 | 788,635
Total financing receivables | 1,939,800 | 1,934,285
Consumer borrowers | Performing | Other loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 19,644 | 25,699
One year ago | 12,357 | 17,676
Two years ago | 7,396 | 3,705
Three years ago | 1,057 | 490
Four years ago | 110 | 355
Prior | 224 | 253
Total financing receivables | 40,788 | 48,178
Consumer borrowers | Non-Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 586 | 1,139
One year ago | 1,421 | 1,224
Two years ago | 3,101 | 607
Three years ago | 2,086 | 292
Four years ago | 668 | 500
Prior | 11,576 | 11,871
Total financing receivables | 19,438 | 15,633
Consumer borrowers | Non-Performing | Real estate loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 224 | 109
One year ago | 472 | 22
Two years ago | 2,110 | 508
Three years ago | 2,057 | 281
Four years ago | 666 | 486
Prior | 11,487 | 11,770
Total financing receivables | 17,016 | 13,176
Consumer borrowers | Non-Performing | Other loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 362 | 1,030
One year ago | 949 | 1,202
Two years ago | 991 | 99
Three years ago | 29 | 11
Four years ago | 2 | 14
Prior | 89 | 101
Total financing receivables | 2,422 | 2,457
Corporate borrowers |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year (Gross write-offs) | 65 | 115
One year ago (Gross write-offs) | 181 | 102
Two years ago (Gross write-offs) | 73 | 1,005
Three years ago (Gross write-offs) | 2,485 | 215
Four years ago (Gross write-offs) | 24 | 1,397
Prior (Gross write-offs) | 1,594 | 2,268
Total financing receivables | 1,738,136 | 1,469,857
Total financing receivables (Gross write-offs) | 4,422 | 5,102
Corporate borrowers | 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 | 0
Prior (Gross write-offs) | 0 | 0
Total financing receivables | 301,477 | 145,286
Total financing receivables (Gross write-offs) | 0 | 0
Corporate borrowers | Non-recourse Loans | The Americas |  |
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 | 0
Prior (Gross write-offs) | 150 | 55
Total financing receivables | 86,724 | 50,263
Total financing receivables (Gross write-offs) | 150 | 55
Corporate borrowers | Real estate 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 | 4
Prior (Gross write-offs) | 78 | 0
Total financing receivables | 415,666 | 334,506
Total financing receivables (Gross write-offs) | 78 | 4
Corporate borrowers | Real estate companies | Other than non-recourse loans | Overseas |  |
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 | 0
Prior (Gross write-offs) | 0 | 0
Total financing receivables | 131,042 | 59,759
Total financing receivables (Gross write-offs) | 0 | 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 | 76
Two years ago (Gross write-offs) | 0 | 54
Three years ago (Gross write-offs) | 0 | 29
Four years ago (Gross write-offs) | 6 | 22
Prior (Gross write-offs) | 140 | 100
Total financing receivables | 225,900 | 180,896
Total financing receivables (Gross write-offs) | 146 | 281
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) | 65 | 115
One year ago (Gross write-offs) | 181 | 26
Two years ago (Gross write-offs) | 73 | 951
Three years ago (Gross write-offs) | 2,485 | 186
Four years ago (Gross write-offs) | 18 | 1,371
Prior (Gross write-offs) | 1,226 | 2,113
Total financing receivables | 577,327 | 699,147
Total financing receivables (Gross write-offs) | 4,048 | 4,762
Corporate borrowers | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 865,495 | 484,932
One year ago | 246,134 | 236,795
Two years ago | 133,623 | 276,776
Three years ago | 154,928 | 96,684
Four years ago | 42,744 | 121,132
Prior | 175,757 | 183,404
Total financing receivables | 1,618,681 | 1,399,723
Corporate borrowers | Performing | Non-recourse Loans | Japan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 225,394 | 97,099
One year ago | 52,292 | 22,621
Two years ago | 10,487 | 10,572
Three years ago | 6,932 | 6,713
Four years ago | 0 | 1,266
Prior | 6,372 | 7,015
Total financing receivables | 301,477 | 145,286
Corporate borrowers | Performing | Non-recourse Loans | The Americas |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 44,762 | 11,804
One year ago | 20,079 | 9,077
Two years ago | 7,540 | 1,742
Three years ago | 886 | 151
Four years ago | 135 | 16,862
Prior | 9,491 | 7,512
Total financing receivables | 82,893 | 47,148
Corporate borrowers | Performing | Real estate companies | Other than non-recourse loans | Japan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 205,004 | 143,553
One year ago | 67,092 | 57,185
Two years ago | 33,558 | 28,355
Three years ago | 23,295 | 22,836
Four years ago | 19,072 | 22,907
Prior | 67,088 | 58,195
Total financing receivables | 415,109 | 333,031
Corporate borrowers | Performing | Real estate companies | Other than non-recourse loans | Overseas |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 57,678 | 4,334
One year ago | 2,458 | 16,493
Two years ago | 8,833 | 9,972
Three years ago | 2,828 | 2,764
Four years ago | 504 | 3,352
Prior | 6,469 | 4,663
Total financing receivables | 78,770 | 41,578
Corporate borrowers | Performing | Commercial, industrial and other companies | Other than non-recourse loans | Japan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 131,439 | 95,090
One year ago | 38,390 | 29,538
Two years ago | 20,382 | 18,606
Three years ago | 10,761 | 11,920
Four years ago | 6,412 | 10,619
Prior | 17,740 | 14,566
Total financing receivables | 225,124 | 180,339
Corporate borrowers | Performing | Commercial, industrial and other companies | Other than non-recourse loans | Overseas |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 201,218 | 133,052
One year ago | 65,823 | 101,881
Two years ago | 52,823 | 207,529
Three years ago | 110,226 | 52,300
Four years ago | 16,621 | 66,126
Prior | 68,597 | 91,453
Total financing receivables | 515,308 | 652,341
Corporate borrowers | Non-Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 2,389 | 5,144
One year ago | 15,254 | 3,346
Two years ago | 9,656 | 26,661
Three years ago | 39,845 | 5,255
Four years ago | 11,919 | 6,705
Prior | 40,392 | 23,023
Total financing receivables | 119,455 | 70,134
Corporate borrowers | Non-Performing | Non-recourse Loans | The Americas |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 0 | 0
One year ago | 0 | 68
Two years ago | 67 | 0
Three years ago | 0 | 0
Four years ago | 0 | 0
Prior | 3,764 | 3,047
Total financing receivables | 3,831 | 3,115
Corporate borrowers | Non-Performing | Real estate companies | Other than non-recourse loans | Japan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 0 | 37
One year ago | 0 | 0
Two years ago | 0 | 0
Three years ago | 0 | 9
Four years ago | 8 | 656
Prior | 549 | 773
Total financing receivables | 557 | 1,475
Corporate borrowers | Non-Performing | Real estate companies | Other than non-recourse loans | Overseas |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 104 | 489
One year ago | 6,964 | 581
Two years ago | 6,586 | 4,444
Three years ago | 8,013 | 515
Four years ago | 4,326 | 2,205
Prior | 26,279 | 9,947
Total financing receivables | 52,272 | 18,181
Corporate borrowers | Non-Performing | Commercial, industrial and other companies | Other than non-recourse loans | Japan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 415 | 2
One year ago | 58 | 80
Two years ago | 130 | 31
Three years ago | 11 | 93
Four years ago | 76 | 38
Prior | 86 | 313
Total financing receivables | 776 | 557
Corporate borrowers | Non-Performing | Commercial, industrial and other companies | Other than non-recourse loans | Overseas |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 1,870 | 4,616
One year ago | 8,232 | 2,617
Two years ago | 2,873 | 22,186
Three years ago | 31,821 | 4,638
Four years ago | 7,509 | 3,806
Prior | 9,714 | 8,943
Total financing receivables | 62,019 | 46,806
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) | 55 | 0
Three years ago (Gross write-offs) | 39 | 0
Four years ago (Gross write-offs) | 0 | 0
Prior (Gross write-offs) | 161 | 0
Total financing receivables | 132,053 | 251,929
Total financing receivables (Gross write-offs) | 255 | 0
Loans to Equity Method Investees | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 515 | 133,587
One year ago | 111,724 | 27,874
Two years ago | 2,028 | 72,407
Three years ago | 0 | 2,091
Four years ago | 1,583 | 58
Prior | 14,858 | 13,983
Total financing receivables | 130,708 | 250,000
Loans to Equity Method Investees | Non-Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 0 | 0
One year ago | 0 | 230
Two years ago | 0 | 327
Three years ago | 0 | 0
Four years ago | 0 | 0
Prior | 1,345 | 1,372
Total financing receivables | 1,345 | 1,929
Purchased loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year (Gross write-offs) | 0 | 1,163
One year ago (Gross write-offs) | 0 | 409
Two years ago (Gross write-offs) | 0 | 229
Three years ago (Gross write-offs) | 57 | 44
Four years ago (Gross write-offs) | 255 | 206
Prior (Gross write-offs) | 7,235 | 45,671
Total financing receivables (Gross write-offs) | 7,547 | 47,722
Purchased loans | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 0 | 145
One year ago | 52 | 16
Two years ago | 14 | 590
Three years ago | 476 | 227
Four years ago | 86 | 4,670
Prior | 19,497 | 13,445
Total financing receivables | 20,125 | 19,093
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 | 31 | 0
Four years ago | 0 | 0
Prior | 1,233 | 880
Total financing receivables | 1,264 | 880
Net investment in leases |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year (Gross write-offs) | 0 | 1
One year ago (Gross write-offs) | 456 | 190
Two years ago (Gross write-offs) | 1,029 | 839
Three years ago (Gross write-offs) | 538 | 422
Four years ago (Gross write-offs) | 353 | 298
Prior (Gross write-offs) | 1,129 | 885
Total financing receivables | 1,167,380 | 1,155,023
Total financing receivables (Gross write-offs) | 3,505 | 2,635
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) | 34 | 26
Two years ago (Gross write-offs) | 135 | 101
Three years ago (Gross write-offs) | 254 | 129
Four years ago (Gross write-offs) | 256 | 158
Prior (Gross write-offs) | 627 | 583
Total financing receivables | 618,963 | 624,094
Total financing receivables (Gross write-offs) | 1,306 | 997
Net investment in leases | Overseas |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year (Gross write-offs) | 0 | 1
One year ago (Gross write-offs) | 422 | 164
Two years ago (Gross write-offs) | 894 | 738
Three years ago (Gross write-offs) | 284 | 293
Four years ago (Gross write-offs) | 97 | 140
Prior (Gross write-offs) | 502 | 302
Total financing receivables | 548,417 | 530,929
Total financing receivables (Gross write-offs) | 2,199 | 1,638
Net investment in leases | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 448,045 | 475,594
One year ago | 316,681 | 291,724
Two years ago | 179,111 | 159,885
Three years ago | 89,639 | 81,835
Four years ago | 47,256 | 56,625
Prior | 64,828 | 68,555
Total financing receivables | 1,145,560 | 1,134,218
Net investment in leases | Performing | Japan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 199,069 | 199,864
One year ago | 145,491 | 139,133
Two years ago | 101,351 | 100,905
Three years ago | 67,720 | 67,932
Four years ago | 40,680 | 46,911
Prior | 60,287 | 64,436
Total financing receivables | 614,598 | 619,181
Net investment in leases | Performing | Overseas |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 248,976 | 275,730
One year ago | 171,190 | 152,591
Two years ago | 77,760 | 58,980
Three years ago | 21,919 | 13,903
Four years ago | 6,576 | 9,714
Prior | 4,541 | 4,119
Total financing receivables | 530,962 | 515,037
Net investment in leases | Non-Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 2,381 | 4,406
One year ago | 5,398 | 4,891
Two years ago | 4,893 | 2,992
Three years ago | 1,879 | 1,529
Four years ago | 836 | 1,368
Prior | 6,433 | 5,619
Total financing receivables | 21,820 | 20,805
Net investment in leases | Non-Performing | Japan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 160 | 213
One year ago | 628 | 585
Two years ago | 763 | 886
Three years ago | 808 | 776
Four years ago | 500 | 657
Prior | 1,506 | 1,796
Total financing receivables | 4,365 | 4,913
Net investment in leases | Non-Performing | Overseas |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current fiscal year | 2,221 | 4,193
One year ago | 4,770 | 4,306
Two years ago | 4,130 | 2,106
Three years ago | 1,071 | 753
Four years ago | 336 | 711
Prior | 4,927 | 3,823
Total financing receivables | ¥ 17,455 | ¥ 15,892

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