Accumulated Other Comprehensive Income (Loss) - Changes in AOCI by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	$ 662,136
Balance at end of year	801,060	$ 662,136
Cumulative Translation Adjustment [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	(46,198)	(54,257)
Other comprehensive income (loss) before reclassifications	8,859	8,059
Amounts reclassified from AOCI	0	0
Balance at end of year	(37,339)	(46,198)
Unrealized Gain (Loss) on Derivatives [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	476	(214)
Other comprehensive income (loss) before reclassifications	(4,583)	1,176
Amounts reclassified from AOCI	5,091	(486)
Balance at end of year	984	476
Minimum Pension/OPEB Liability Adjustment [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	(21,855)	(24,967)
Other comprehensive income (loss) before reclassifications	(3,639)	2,315
Amounts reclassified from AOCI	8,291	797
Balance at end of year	(17,203)	(21,855)
Accumulated Other Comprehensive Income Attributable to Unconsolidated Affiliates [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	(1,193)	(354)
Other comprehensive income (loss) before reclassifications	(132)	(839)
Amounts reclassified from AOCI	0	0
Balance at end of year	(1,325)	(1,193)
AOCI Attributable to Parent [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	(68,770)	(79,792)
Other comprehensive income (loss) before reclassifications	505	10,711
Amounts reclassified from AOCI	13,382	311
Balance at end of year	$ (54,883)	$ (68,770)