Pension Benefits - Changes in Benefit Obligation and Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 26, 2021	Dec. 27, 2020
Amount recognized in the Consolidated Balance Sheets
Pension assets	$ 69,521	$ 87,601
Pension Plan
Change in benefit obligation
Benefit obligation at beginning of year	1,714,954	1,808,605
Service cost	11,631	9,200	$ 10,548
Interest cost	40,492	34,869	50,311
Actuarial (gain)/loss	(420,944)	(50,645)
Curtailments	0	(163)
Benefits paid	(90,036)	(86,805)
Effects of change in currency conversion	(77)	(107)
Benefit obligation at end of year	1,256,020	1,714,954	1,808,605
Change in plan assets
Fair value of plan assets at beginning of year	1,550,078	1,585,221
Actual return on plan assets	(343,215)	25,651
Employer contributions	29,106	26,011
Benefits paid	(90,036)	(86,805)
Fair value of plan assets at end of year	1,145,933	1,550,078	1,585,221
Net amount recognized	(110,087)	(164,876)
Amount recognized in the Consolidated Balance Sheets
Pension assets	69,521	87,601
Current liabilities	(16,361)	(16,669)
Noncurrent liabilities	(163,247)	(235,808)
Net amount recognized	(110,087)	(164,876)
Amount recognized in accumulated other comprehensive loss
Actuarial loss	507,397	549,534
Prior service credit	(10,468)	(12,365)
Total	496,929	537,169
Qualified Plans | Pension Plan
Change in benefit obligation
Benefit obligation at beginning of year	1,475,764	1,549,012
Service cost	11,526	9,105	10,429
Interest cost	35,350	30,517	43,710
Actuarial (gain)/loss	(374,109)	(42,883)
Curtailments	0	0
Benefits paid	(72,119)	(69,987)
Effects of change in currency conversion	0	0
Benefit obligation at end of year	1,076,412	1,475,764	1,549,012
Change in plan assets
Fair value of plan assets at beginning of year	1,550,078	1,585,221
Actual return on plan assets	(343,215)	25,651
Employer contributions	11,189	9,193
Benefits paid	(72,119)	(69,987)
Fair value of plan assets at end of year	1,145,933	1,550,078	1,585,221
Net amount recognized	69,521	74,314
Amount recognized in the Consolidated Balance Sheets
Pension assets	69,521	87,601
Current liabilities	0	0
Noncurrent liabilities	0	(13,287)
Net amount recognized	69,521	74,314
Amount recognized in accumulated other comprehensive loss
Actuarial loss	438,145	426,874
Prior service credit	(11,007)	(12,952)
Total	427,138	413,922
Non- Qualified Plans | Pension Plan
Change in benefit obligation
Benefit obligation at beginning of year	239,190	259,593
Service cost	105	95	119
Interest cost	5,142	4,352	6,601
Actuarial (gain)/loss	(46,835)	(7,762)
Curtailments	0	(163)
Benefits paid	(17,917)	(16,818)
Effects of change in currency conversion	(77)	(107)
Benefit obligation at end of year	179,608	239,190	259,593
Change in plan assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	17,917	16,818
Benefits paid	(17,917)	(16,818)
Fair value of plan assets at end of year	0	0	$ 0
Net amount recognized	(179,608)	(239,190)
Amount recognized in the Consolidated Balance Sheets
Pension assets	0	0
Current liabilities	(16,361)	(16,669)
Noncurrent liabilities	(163,247)	(222,521)
Net amount recognized	(179,608)	(239,190)
Amount recognized in accumulated other comprehensive loss
Actuarial loss	69,252	122,660
Prior service credit	539	587
Total	$ 69,791	$ 123,247