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Retirement benefit plans (Tables)
 12 Months Ended
Dec. 31, 2019
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Summary of Amounts Recognized in Statements of Financial Position
 (a)
The amounts recognized in the statements of financial position are as follows:
 
   
December 31,
2018
   
December 31,
2019
 
   
NT$000
   
NT$000
 
Present value of defined benefit obligations
   (910,081)    (901,159) 
Fair value of plan assets
   389,316    421,052 
  
 
 
   
 
 
 
Net defined benefit liability
  
 
(520,765
) 
  
 
(480,107
) 
  
 
 
   
 
 
 
Summary of Movements in net Defined Benefit Liability
 (b)
Movements in net defined benefit liability are as follows:
 
 
  
2018
 
 
  
Present value of

defined benefit
obligations
 
  
Fair value of

plan assets
 
  
Net defined

benefit

liability
 
 
  
NT$000
 
  
NT$000
 
  
NT$000
 
January 1
  
 
(838,543
) 
  
 
360,017
 
  
 
(478,526
) 
Current services cost
  
 
(382
) 
  
 
—  
 
  
 
(382
) 
Interest (expense) income
  
 
(14,429
) 
  
 
6,291
 
  
 
(8,138
) 
 
  
 
 
 
  
 
 
 
  
 
 
 
 
  
 
(853,354
) 
  
 
366,308
 
  
 
(487,046
) 
 
  
 
 
 
  
 
 
 
  
 
 
 
Remeasurements:
  
   
  
   
  
   
Return on plan assets (excluding amounts included in interest income or expense)
  
 
—  
 
  
 
8,145
 
  
 
8,145
 
Financial assumption movement effect
  
 
(56,934
) 
  
 
—  
 
  
 
(56,934
) 
Experience adjustments
  
 
(11,172
) 
  
 
—  
 
  
 
(11,172
) 
 
  
 
 
 
  
 
 
 
  
 
 
 
 
  
 
(68,106
) 
  
 
8,145
 
  
 
(59,961
) 
 
  
 
 
 
  
 
 
 
  
 
 
 
Pension fund contribution
  
 
—  
 
  
 
26,242
 
  
 
26,242
 
Paid pension
  
 
11,379
 
  
 
(11,379
) 
  
 
—  
 
 
  
 
 
 
  
 
 
 
  
 
 
 
December 31
  
 
(910,081
) 
  
 
389,316
 
  
 
(520,765
) 
 
  
 
 
 
  
 
 
 
  
 
 
 
 
  
2019
 
 
  
Present value of
defined benefit
obligations
 
  
Fair value of

plan assets
 
  
Net defined

benefit
liability
 
 
  
NT$000
 
  
NT$000
 
  
NT$000
 
January 1
  
 
(910,081
) 
  
 
389,316
 
  
 
(520,765
) 
Current services cost
  
 
(332
) 
  
 
—  
 
  
 
(332
) 
Interest (expense) income
  
 
(11,170
) 
  
 
4,831
 
  
 
(6,339
) 
 
  
 
 
 
  
 
 
 
  
 
 
 
 
  
 
(921,583
) 
  
 
394,147
 
  
 
(527,436
) 
 
  
 
 
 
  
 
 
 
  
 
 
 
Remeasurements:
  
   
  
   
  
   
Return on plan assets (excluding amounts included in interest income or expense)
  
 
—  
 
  
 
12,601
 
  
 
12,601
 
Financial assumption movement effect
  
 
(27,993
) 
  
 
—  
 
  
 
(27,993
) 
Experience adjustments
  
 
36,308
 
  
 
—  
 
  
 
36,308
 
 
  
 
 
 
  
 
 
 
  
 
 
 
 
  
 
8,315
 
  
 
12,601
 
  
 
20,916
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Pension fund contribution
  
 
—  
 
  
 
26,413
 
  
 
26,413
 
Paid pension
  
 
12,109
 
  
 
(12,109
) 
  
 
—  
 
 
  
 
 
 
  
 
 
 
  
 
 
 
December 31
  
 
(901,159
) 
  
 
421,052
 
  
 
(480,107
) 
 
  
 
 
 
  
 
 
 
  
 
 
 
Principal Actuarial Assumptions
 (d)
The principal actuarial assumptions used were as follows
 
   
2018
  
2019
 
Discount rate
   1.25%   1.00% 
Future salary increase
   3.50%   3.50% 
Sensitivity Analysis of Present Value of Defined Benefit Obligations Effected by Changes of Significant Actuarial Assumptions
 
Because the main actuarial assumption changed, the present value of defined benefit obligations is affected. The analysis was as follows:
 
   
Discount rate
   
Future salary increase
 
   
Increase
0.25%
   
Decrease
0.25%
   
Increase
0.25%
   
Decrease
0.25%
 
   
NT$000
   
NT$000
   
NT$000
   
NT$000
 
December 31, 2018
        
Effect on present value of defined benefit obligations
  
 
(29,052
) 
  
 
30,430
 
  
 
29,692
 
  
 
(28,513
) 
December 31, 2019
        
Effect on present value of defined benefit obligations
  
 
(27,993
) 
  
 
29,284
 
  
 
28,501
 
  
 
(27,407
) 
Analysis of Timing of the Future Pension Payment
 (f)
As of December 31, 2019, the weighted average duration of that retirement plan is 12.8 years. The analysis of timing of the future pension payment is as follows:
 
   
December 31,

2019
 
   
NT$000
 
Within 1 year
   35,272 
1-2
years
   34,647 
2-5
years
   122,670 
5-10
years
   167,707 
  
 
 
 
  
 
360,296