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Employee benefit plans (Tables)
12 Months Ended
Mar. 31, 2019
Employee Benefit Plans [Abstract]  
Net periodic benefit cost for defined benefit plans
     Millions of yen  
     Year ended March 31  
     2017     2018     2019  

Service cost

   ¥ 8,909     ¥ 9,565     ¥ 11,270  

Interest cost

     1,444       2,258       2,180  

Expected return on plan assets

     (6,004     (6,066     (6,068

Amortization of net actuarial losses

     2,867       2,979       3,831  

Amortization of prior service cost

     (1,090     (1,061     (1,059
  

 

 

   

 

 

   

 

 

 

Net periodic benefit cost

   ¥ 6,126     ¥ 7,675     ¥ 10,154  
  

 

 

   

 

 

   

 

 

 

Reconciliation of changes in projected benefit obligation and fair value of plan assets
     Millions of yen  
     As of or for the year ended March 31  
                 2018                             2019              

Change in projected benefit obligation:

    

Projected benefit obligation at beginning of year

   ¥ 269,736     ¥ 287,983  

Service cost

     9,565       11,270  

Interest cost

     2,258       2,180  

Actuarial gain

     17,004       25,855  

Benefits paid

     (10,581     (11,953

Acquisition, divestitures and other

     1       88  
  

 

 

   

 

 

 

Projected benefit obligation at end of year

   ¥ 287,983     ¥ 315,423  
  

 

 

   

 

 

 

Change in plan assets:

    

Fair value of plan assets at beginning of year

   ¥ 233,945     ¥ 234,050  

Actual return on plan assets

     5,128       3,574  

Employer contributions

     4,139       4,484  

Benefits paid

     (9,162     (9,223
  

 

 

   

 

 

 

Fair value of plan assets at end of year

   ¥ 234,050     ¥ 232,885  
  

 

 

   

 

 

 

Funded status at end of year

     (53,933     (82,538
  

 

 

   

 

 

 

Amounts recognized in the consolidated balance sheets

   ¥ (53,933   ¥ (82,538
  

 

 

   

 

 

 

Projected benefit obligation, accumulated benefit obligation and fair value of plan assets for pension plans with ABO and PBO in excess of plan assets
     Millions of yen  
     March 31  
     2018      2019  

Plans with ABO in excess of plan assets:

     

PBO

   ¥ 53,933      ¥ 82,538  

ABO

     53,933        82,538  

Fair value of plan assets

     —          —    

Plans with PBO in excess of plan assets:

     

PBO

   ¥ 53,933      ¥ 82,538  

ABO

     53,933        82,538  

Fair value of plan assets

     —          —    

 

Amounts in accumulated other comprehensive income, pre-tax, that have not yet been recognized as components of net periodic benefit cost
     Millions of yen  
     For the year ended
March 31, 2019
 

Net actuarial loss

   ¥ 109,422  

Net prior service cost

     (5,518
  

 

 

 

Total

   ¥ 103,904  
  

 

 

 

Amounts in accumulated other comprehensive income, pre-tax, expected to be recognized as components of net periodic benefit cost over next fiscal year
     Millions of yen  
     For the year ending
March 31, 2020
 

Net actuarial loss

   ¥ 5,319  

Net prior service cost

     (1,114
  

 

 

 

Total

   ¥ 4,205  
Schedule of weighted-average assumptions used to determine PBO
     March 31  
     2018     2019  

Discount rate

     0.8     0.6

Rate of increase in compensation levels

     1.7     1.6

Weighted-average assumptions used to determine net periodic benefit costs
     Year ended March 31  
     2017     2018     2019  

Discount rate

     0.6     0.9     0.8

Rate of increase in compensation levels

     2.5     2.5     1.7

Expected long-term rate of return on plan assets

     2.6     2.6     2.6

Information about plan assets at fair value
     Millions of yen  
     March 31, 2018  
     Level 1      Level 2      Level 3      Balance as of
March 31, 2018
 

Pension plan assets:

           

Equities

   ¥ 27,001      ¥ —        ¥ —        ¥ 27,001  

Private equity investments

     —          2,473        3,639        6,112  

Japanese government securities

     40,938        —          —          40,938  

Foreign government, agency and municipal securities

     —          —          —          —    

Bank and corporate debt securities

     2,351        2,218        —          4,569  

Investment trust funds and other(1)(2)

     —          6,291        53,681        59,972  

Life insurance company general accounts

     —          53,835        —          53,835  

Other assets

     —          40,679        —          40,679  
  

 

 

    

 

 

    

 

 

    

 

 

 

Total

   ¥ 70,290      ¥ 105,496      ¥ 57,320      ¥ 233,106  
  

 

 

    

 

 

    

 

 

    

 

 

 

 

     Millions of yen  
     March 31, 2019  
     Level 1      Level 2      Level 3      Balance as of
March 31, 2019
 

Pension plan assets:

           

Equities

   ¥ 21,991      ¥ —        ¥ —        ¥ 21,991  

Private equity investments

     —          9,145        3,823        12,968  

Japanese government securities

     25,980        —          —          25,980  

Foreign government, agency and municipal securities

     —          22        —          22  

Bank and corporate debt securities

     2,566        2,082        —          4,648  

Investment trust funds and other(1)(2)

     —          6,070        56,007        62,077  

Life insurance company general accounts

     —          64,437        —          64,437  

Other assets

     —          39,748        —          39,748  
  

 

 

    

 

 

    

 

 

    

 

 

 

Total

   ¥ 50,537      ¥ 121,504      ¥ 59,830      ¥ 231,871  
  

 

 

    

 

 

    

 

 

    

 

 

 

 

(1)

Includes hedge funds and real estate funds.

(2)

Certain assets that are measured at fair value using net asset value per share as a practical expedient have not been classified in the fair value hierarchy. As of March 31, 2018 and March 31, 2019, the fair values of these assets were ¥944 million and ¥1,014 million, respectively.

Information about plan assets for which Level 3 inputs are utilized to determine fair value
     Millions of yen  
     Year ended March 31, 2018        
     Balance
as of
April 1,
2017
     Unrealized
and realized
gains / loss
    Purchases /
sales and
other
settlement
    Balance
as of
March 31,
2018
 

Private equity investments

   ¥ 6,785      ¥ (657   ¥ (2,489   ¥ 3,639  

Investment trust funds and other

     49,721        253       3,707       53,681  
  

 

 

    

 

 

   

 

 

   

 

 

 

Total

   ¥ 56,506      ¥ (404   ¥ 1,218     ¥ 57,320  
  

 

 

    

 

 

   

 

 

   

 

 

 
     Millions of yen  
     Year ended March 31, 2019        
     Balance
as of
April 1,
2018
     Unrealized
and realized
gains / loss
    Purchases /
sales and
other
settlement
    Balance
as of
March 31,
2019
 

Private equity investments

   ¥ 3,639      ¥ (349   ¥ 533     ¥ 3,823  

Investment trust funds and other

     53,681        792       1,534       56,007  
  

 

 

    

 

 

   

 

 

   

 

 

 

Total

   ¥ 57,320      ¥ 443     ¥ 2,067     ¥ 59,830  
  

 

 

    

 

 

   

 

 

   

 

 

 

Expected benefit payments

Year ending March 31

   Millions of yen  

2020

   ¥ 11,272  

2021

     10,458  

2022

     10,649  

2023

     11,022  

2024

     11,521  

2025-2029

     59,625