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Summary of accounting policies (Tables)
 12 Months Ended
Mar. 31, 2023
Accounting Policies [Abstract]  
Schedule of estimated useful lives for significant asset classes
T
he estimated useful lives for significant asset classes are as follows:
 
Office buildings
      3 to 50 years  
Equipment and facilities
      3 to 20 years  
Software
      3 to 10 years  
Schedule of the impact of correction of each of these errors on prior amounts
The following tables present the impact of correction of each of these errors on prior amounts as previously reported in specific line items in the consolidated statement of cash flows and the restated amounts for the years ended March 31, 2021, March 31, 2022, and March 31, 2023.
 
Year ended March 31, 2023
Millions of yen
 
As Previously Reported
 
 
 
 
 
As Restated
 
Line item
  
Amount
 
 
Adjustment
 
 
Line item
  
Amount
 
[Line item not previously reported]
     —     (4,047 )  
Provision for credit losses
      (4,047 )
Time deposits
      (70,532 )      70,532    
[Line item removed
]

      —  
Trading assets and private equity and debt investments
      (1,576,531 )      (46,506 )  
Trading assets and private equity and debt investments
      (1,623,037 )
Other secured borrowings
      (62,416 )      62,416    
[Line item removed]
      —  
Loans and receivables, net of allowance for credit losses
      178,254       294,557    
Margin loans and receivables
      472,811  
Other, net
      (278,296 )      (97,022 )  
Other, net
      (375,318 )
  
 
 
    
 
 
       
 
 
  
Net cash provided by (used in) operating activities
      (974,750 )      279,930    
Net cash provided by (used in) operating activities
      (694,820 )
  
 
 
    
 
 
       
 
 
  
[Line item not previously reported]
    —     (344,117 )  
Payments for placements of time deposits
      (344,117 )
[Line item not previously reported]
    —     284,705    
Proceeds from redemption or maturity of time deposits
      284,705  
Payments for purchases of investments in equity securities
      (100 )      100    
[Line item removed]
    —
Proceeds from sales of investments in equity securities
      35,499       (35,499 )
 
  
[Line item removed]
    —
[Line item not previously reported]
      —     (4,471 )  
Payments for purchases of equity investments
      (4,471 )
 
[Line item not previously reported]
      —     52,299    
Proceeds from sales of equity investments
      52,299  
Increase in loans receivable at banks, net
      (84,570 )      208  
Net cash outflows from loans receivable at banks
      (84,362 )
[Line item not previously reported]
      —     (4,702,061 )  
Payments for purchases or origination of other non-trading loans
      (4,702,061 )
[Line item not previously reported]
      —     4,486,651  
Proceeds from sales or repayments of other non-trading loans
      4,486,651
 
 
Year ended March 31, 2023
Millions of yen
 
As Previously Reported
 
 
 
 
 
As Restated
 
Line item
  
Amount
 
 
Adjustment
 
 
Line item
  
Amount
 
[Line item not previously reported]
  
 
— 
 
 
 
(62
) 
 
Net cash outflows from interbank money market loans
  
 
(62
) 
Decrease (increase) in non-trading debt securities, net
      159,558       —    
Payments for purchases of non-trading debt securities
      (45,910 )
            
Proceeds from sales or maturity of non-trading debt securities
      205,468  
Business combinations or disposals, net
      16,950       —    
Acquisitions, net of cash acquired
      —   
            
Divestures, net of cash disposed of
      16,950  
Decrease (increase) in investments in affiliated companies, net
      18,180       —    
Payments for purchases of investments in affiliated companies
      (25,119 )
            
Proceeds from sales of investments in affiliated companies
      43,299  
Other, net
      945       (9,923 )  
Other, net
      (8,978 )
  
 
 
    
 
 
       
 
 
  
Net cash provided by (used in) investing activities
      38,945       (272,170 )  
Net cash provided by (used in) investing activities
      (233,225 )
  
 
 
    
 
 
       
 
 
  
Increase in long-term borrowings
      2,337,586       (129,164 )  
Proceeds from issuances of long-term borrowings
      2,208,422  
Decrease in long-term borrowings
      (1,230,365 )      115,194    
Payments for repurchases or maturity of long-term borrowings
      (1,115,171 )
Decrease
 in short-term borrowings, net
      (81,925 )      81,925    
[Line item removed]
      —  
[Line item not previously reported]
    —     2,630,083    
Proceeds from issuances of short-term borrowings
      2,630,083  
[Line item not previously reported]
    —     (2,694,588 )  
Payments for repurchases or maturity of short-term borrowings
      (2,694,588 )
[Line item not previously reported]
    —     48,197    
Net cash inflows (outflows) from interbank money market borrowings
      48,197  
[Line item not previously reported]
    —     (52,915 )  
Net cash inflows (outflows) from other secured borrowings
      (52,915 )
Increase in deposits received at banks, net
      326,299       2,568    
Net cash inflows from deposits received at banks
      328,867  
[Line item not previously reported]
    —     (9,060 )  
Payments for withholding taxes on stock-based compensation
      (9,060 )
  
 
 
    
 
 
       
 
 
  
Net cash provided by (used in) financing activities
      1,291,697       (7,760 )  
Net cash provided by (used in) financing activities
      1,283,937  
  
 
 
    
 
 
       
 
 
  
 
 
Year ended March 31, 2022
Millions of yen
 
As Previously Reported
 
 
 
 
 
As Restated
 
Line item
  
Amount
 
 
Adjustment
 
 
Line item
  
Amount
 
[Line item not previously reported]
      —     8,749    
Provision for credit losses
      8,749  
Time deposits
      (23,064 )      23,064    
[Line item removed]
      —  
Trading assets and private equity and debt investments
      1,254,261       (24,704 )   
Trading assets and private equity and debt investments
      1,229,557  
Other secured borrowings
      2,120       (2,120 )   
[Line item removed]
      —   
Loans and receivables, net of allowance for credit losses
      (412,429 )      523,897    
Margin loans and receivables
      111,468  
Other, net
      (102,119 )      (23,008 )  
Other, net
      (125,127 )
  
 
 
    
 
 
       
 
 
  
Net cash provided by (used in) operating activities
      (1,368,710 )      505,878    
Net cash provided by (used in) operating activities
      (862,832 )
  
 
 
    
 
 
       
 
 
  
[Line item not previously reported]
      —     (227,644 )  
Payments for placements of time deposits
      (227,644 )
[Line item not previously reported]
      —     199,475    
Proceeds from redemption or maturity of time deposits
      199,475  
Payments for purchases of investments in equity securities
      (300 )      300    
[Line item removed
]

    —
Proceeds from sales of investments in equity securities
      2,502       (2,502 )  
[Line item removed]
    —
[Line item not previously reported]
      —       (3,142 )  
Payments for purchases of equity investments
      (3,142 )
[Line item not previously reported]
      —       41,089    
Proceeds from sales of equity investments
      41,089  
Increase in loans receivable at banks, net
      (112,782 )      1,971    
Net cash outflows from loans receivable at banks
      (110,811 ) 
[Line item not previously reported]
      —     (5,695,122 )  
Payments for purchases or origination of other non-trading loans
      (5,695,122 )
[Line item not previously reported]
      —     5,172,221    
Proceeds from sales or repayments of other non-trading loans
      5,172,221  
[Line item not previously reported]
      —     (808 )  
Net cash outflows from interbank money market loans
      (808 )
Decrease (increase) in non-trading debt securities, net
      (51,065 )      —     
Payments for purchases of non-trading debt securiti
es

      (106,390 )
            
Proceeds from sales or maturity of non-trading debt securities
      55,325  
Decrease (increase) in investments in affiliated companies, net
      103,437       —     
Payments for purchases of investments in affiliated companies
      (5,674 )
            
Proceeds from sales of investments in affiliated companies
      109,111  
Other, net
      29,253       (33,719 )  
Other, net
      (4,466 )
  
 
 
    
 
 
       
 
 
  
Net cash provided by (used in) investing activities
      (45,301 )      (547,881 )  
Net cash provided by (used in) investing activities
      (593,182 )
  
 
   
 
 
       
 
 
  
Increase in long-term borrowings
      3,895,059       (446 )   
Proceeds from issuances of long-term borrowings
      3,894,613  
Decrease in long-term borrowings
      (2,670,106 )      13,873    
Payments for repurchases or maturity of long-term borrowings
      (2,656,233 ) 
Decrease in short-term borrowings, net
      (475,509 )      475,509    
[Line item removed]
      —   
[Line item not previously reported]
      —        1,743,817    
Proceeds from issuances of short-term borrowings
      1,743,817  
[Line item not previously reported]
      —        (2,164,098 )   
Payments for repurchases or maturity of short-term borrowings
      (2,164,098 ) 
[Line item not previously reported]
      —        12,925    
Net cash inflows (outflows) from interbank money market borrowings
      12,925  
 
 
Year ended March 31, 2022
Millions of yen
 
As Previously Reported
 
 
 
 
 
As Restated
 
Line item
  
Amount
 
 
Adjustment
 
 
Line item
  
Amount
 
[Line item not previously reported]
    —     30,753    
Net cash inflows (outflows) from other secured borrowings
      30,753  
Increase in deposits received at banks, net
      448,099       (75,524 )  
Net cash inflows from deposits received at banks
      372,575  
[Line item not previously reported]
    —     (10,816 )   
Payments for withholding taxes on stock-based compensation
      (10,816 ) 
Contributions from noncontrolling interests
      —       42,881    
Contributions from noncontrolling interests
      42,881  
Distributions to noncontrolling interests
      (16,475 )     (26,871 )  
Distributions to noncontrolling interests
      (43,346 )
  
 
 
    
 
 
       
 
 
  
Net cash provided by (used in) financing activities
      1,070,715       42,003    
Net cash provided by (used in) financing activities
      1,112,718  
  
 
 
    
 
 
       
 
 
  
 
Year ended March 31, 2021
Millions of yen
 
As Previously Reported
 
 
 
 
 
As Restated
 
Line item
  
Amount
 
 
Adjustment
 
 
Line item
  
Amount
 
[Line item not previously reported]
      —      38,303    
Provision for credit losses
      38,303  
Time deposits
      43,560       (43,560 )  
[Line item removed]
      —   
Trading assets and private equity and debt investments
      1,468,357       (26,818 )  
Trading assets and private equity and debt investments
      1,441,539  
Other secured borrowings
      (326,450 )     326,450    
[Line item removed]
      —  
Loans and receivables, net of allowance for credit losses
      1,145,429       (209,083 )  
Margin loans and receivables
      936,346  
Other, net
      20,089       (83,452 )  
Other, net
      (63,363 )
  
 
 
    
 
 
       
 
 
  
Net cash provided by (used in) operating activities
      665,770       1,840  
Net cash provided by (used in) operating activities
      667,610  
  
 
 
    
 
 
       
 
 
  
[Line item not previously reported]
    —     (239,980 )  
Payments for placements of time deposits
      (239,980 )
[Line item not previously reported]
    —     283,650    
Proceeds from redemption or maturity of time deposits
      283,650  
Proceeds from sales of investments in equity securities
      6,502     (6,502
)
  
[Line item removed]
    —
[Line item not previously reported]
      —        (20,115 )  
Payments for purchases of equity investments
      (20,115 )
[Line item not previously reported]
  
 
— 
 
 
 
20,258
 
 
Proceeds from sales of equity investments
  
 
20,258
 
Increase in loans receivable at banks, net
  
 
 (83,412 ) 
 
 
290
 
 
Net cash outflows from loans receivable at banks
  
 
(83,122
)
[Line item not previously reported]
  
 
— 
 
 
 
(3,362,619
)
 
Payments for purchases or origination of other non-trading loans
  
 
(3,362,619
)
[Line item not previously reported]
  
 
— 
 
 
 
3,713,333
 
 
Proceeds from sales or repayments of other non-trading loans
  
 
3,713,333
 
[Line item not previously reported]
  
 
— 
 
 
 
(355
)
 
 
Net cash outflows from interbank money market loans
  
 
(355
)
Decrease (increase) in non-trading debt securities, net
  
 
38,409
 
 
 
— 
 
 
Payments for purchases of non-trading debt securities
  
 
(124,614
)
  
 
 
Proceeds from sales or maturity of non-trading debt securities
  
 
163,023
 
Business combinations or disposals, net
  
 
(11,152
) 
 
 
— 
 
 
Acquisitions, net of cash acquired
  
 
(11,152
)
 
  
 
 
Divestures, net of cash disposed of
  
 
— 
 
 
Year ended March 31, 2021
Millions of yen
 
As Previously Reported
 
 
 
 
 
As Restated
 
Line item
  
Amount
 
 
Adjustment
 
 
Line item
  
Amount
 
Decrease (increase) in investments in affiliated companies, net
  
 
(9,182
) 
 
 
9,182
 
 
[Line item removed]
  
— 
[Line item not previously reported]
  
— 
 
 
(12,098
)
 
Payments for purchases of investments in affiliated companies
  
 
(12,098
)
[Line item not previously reported]
  
— 
 
 
1,221
 
 
Proceeds from sales of investments in affiliated companies
  
 
1,221
 
Other, net
  
 
(9,958
) 
 
 
10,693
 
 
Other, net
  
 
735
 
  
 
 
 
 
 
 
 
 
  
 
 
 
Net cash provided by (used in) investing activities
  
 
(139,026
) 
 
 
396,958
 
 
Net cash provided by (used in) investing activities
  
 
257,932
 
  
 
 
 
 
 
 
 
 
  
 
 
 
Increase in long-term borrowings
  
 
2,067,725
 
 
 
(4,462
)
 
Proceeds from issuances of long-term borrowings
  
 
2,063,263
 
Decrease in long-term borrowings
  
 
(2,068,695
) 
 
 
(26,374
)
 
Payments for repurchases or maturity of long-term borrowings
  
 
(2,095,069
)
Increase (decrease) in short-term borrowings, net
  
 
(325,237
) 
 
 
325,237
 
 
[Line item removed]
  
 
— 
 
[Line item not previously reported]
  
 
— 
 
 
 
2,929,762
 
 
Proceeds from issuances of short-term borrowings
  
 
2,929,762
 
[Line item not previously reported]
  
 
— 
 
 
 
(2,865,700
)
 
 
Payments for repurchases or maturity of short-term borrowings
  
 
(2,865,700
)
 
[Line item not previously reported]
  
 
— 
 
 
 
(311,471
)
 
Net cash inflows (outflows) from interbank money market borrowings
  
 
(311,471
)
[Line item not previously reported]
  
 
— 
 
 
 
(335,372
)
 
Net cash inflows (outflows) from other secured borrowings
  
 
(335,372
)
Increase in deposits received at banks, net
  
 
126,177
 
 
 
(89,954
)
 
Net cash inflows from deposits received at banks
  
 
36,223
 
[Line item not previously reported]
  
 
— 
 
 
 
(3,856
)
 
Payments for withholding taxes on stock-based compensation
  
 
(3,856
)
Contributions from noncontrolling interests
  
 
6,257
 
 
 
18,537
 
 
Contributions from noncontrolling interests
  
 
24,794
 
Distributions to noncontrolling interests
  
 
— 
 
 
 
(35,145
)
 
Distributions to noncontrolling interests
  
 
(35,145
)
  
 
 
 
 
 
 
 
 
  
 
 
 
Net cash provided by (used in) financing activities
  
 
(269,927
) 
 
 
(398,798
)
 
Net cash provided by (used in) financing activities
  
 
(668,725
)