CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Cash flows from operating activities:
Net income	$ 95,070	$ 456,536	$ 246,804
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	337,104	287,230	274,088
Deferred income tax expense	37,337	42,478	32,540
Gain on property disposals	(13,766)	(10,896)	(1,889)
Loan cost amortization	4,848	4,821	5,569
Gain on bargain purchase	3,746	(56,880)	0
Accretion of bond discount	982	982	812
Amortization of bond premium	(668)	(668)	(668)
Loss (gain) on equity method investments	291	(63)	(63)
Stock-based compensation	(276)	10,132	13,153
Noncash loss on subsidiary dissolution	115	0	0
Foreign currency transaction losses (gains) related to borrowing arrangements	0	(4,970)	5,267
Loss on early extinguishment of debt recognized as a component of interest expense	0	0	15,818
Asset impairment	0	0	3,504
Changes in operating assets and liabilities:
Trade accounts and other receivables	29,154	(25,000)	(10,918)
Inventories	26,041	(111,748)	83,174
Prepaid expenses and other current assets	(50,347)	(15,490)	(11,612)
Accounts payable and accrued expenses	295,327	119,892	86,834
Income taxes	(39,436)	(26,378)	(248,470)
Long-term pension and other postretirement obligations	(7,883)	(9,221)	(6,751)
Other operating assets and liabilities	6,608	5,764	4,458
Cash provided by operating activities	724,247	666,521	491,650
Cash flows from investing activities:
Acquisitions of property, plant and equipment	(354,762)	(348,120)	(348,666)
Proceeds from property disposals	31,976	15,753	9,775
Purchase of acquired business, net of cash acquired	(4,216)	(384,694)	0
Cash used in investing activities	(327,002)	(717,061)	(338,891)
Cash flows from financing activities:
Payments on revolving line of credit, long-term borrowings and finance lease obligations	(430,988)	(289,917)	(1,117,009)
Proceeds from revolving line of credit and long-term borrowings	404,522	259,466	748,382
Purchase of common stock under stock repurchase program	(110,242)	(2,898)	(236)
Payment of capitalized loan costs	0	(652)	(12,581)
Proceeds (distribution) from capital contribution under the TSA	0	(525)	5,558
Payment on early extinguishment of debt	0	0	(9,781)
Capital contributions to subsidiary by noncontrolling stockholders	0	0	1,421
Cash used in financing activities	(136,708)	(34,526)	(384,246)
Effect of exchange rate changes on cash and cash equivalents	7,292	4,065	3,534
Increase (decrease) in cash and cash equivalents	267,829	(81,001)	(227,953)
Cash and cash equivalents, beginning of year	280,577	361,578	589,531
Cash and cash equivalents, end of year	548,406	280,577	361,578
Supplemental Disclosure Information:
Interest paid (net of amount capitalized)	130,641	130,882	154,627
Income taxes paid	$ 51,710	$ 125,856	$ 253,932