Consolidated Statement of Cash Flows - USD ($)	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Cash flows from operating activities
Net earnings	$ 225,441,000	$ 520,454,000	$ 220,434,000
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation of property, plant and equipment	120,229,000	133,528,000	139,255,000
Impairment of goodwill	0	0	86,253,000
Asset Impairments	71,540,000	0	31,303,000
Non-cash pension settlement	0	110,962,000	0
Amortization of intangible assets	144,746,000	47,259,000	28,703,000
Program cost amortization	387,056,000	85,585,000	43,906,000
Deferred income taxes	30,316,000	(14,956,000)	(11,094,000)
Stock-based compensation	49,748,000	28,044,000	27,892,000
Other non-cash items	7,396,000	(54,184,000)	(18,879,000)
Changes in operating assets and liabilities, net of acquired and disposed balances:
Decrease (increase) in accounts receivable	210,823,000	(211,450,000)	180,113,000
Decrease (increase) in inventories	62,757,000	(4,631,000)	(37,211,000)
(Increase) decrease in prepaid expenses and other current assets	(7,470,000)	18,106,000	(11,929,000)
Program spend, net	(438,854,000)	(33,851,000)	(131,984,000)
Increase in accounts payable and accrued liabilities	49,288,000	62,277,000	107,426,000
Change in net deemed repatriation tax	(18,364,000)	(14,550,000)	27,027,000
Other	81,688,000	(19,532,000)	(35,218,000)
Net cash provided by operating activities	976,340,000	653,061,000	645,997,000
Cash flows from investing activities
Additions to property, plant and equipment	(125,754,000)	(133,636,000)	(140,426,000)
Investments and acquisitions, net of cash acquired	(4,412,948,000)	(8,761,000)	(155,451,000)
Net gains on derivative contracts	0	79,990,000	0
Other	38,471,000	1,452,000	9,400,000
Net cash utilized by investing activities	(4,500,231,000)	(60,955,000)	(286,477,000)
Cash flows from financing activities
Net proceeds from borrowings with maturity greater than three months	1,112,640,000	2,354,957,000	0
Repayments of borrowings with maturity greater than three months	(275,514,000)	0	0
Net repayments of other short-term borrowings	(8,617,000)	(8,828,000)	(142,357,000)
Purchases of common stock	0	(61,387,000)	(250,054,000)
Stock-based compensation transactions	16,592,000	31,786,000	29,999,000
Dividends paid	(372,652,000)	(336,604,000)	(309,258,000)
Payments related to tax withholding for share-based compensation	(6,040,000)	(13,123,000)	(58,344,000)
Redemption of Equity Instruments	(47,399,000)	0	0
Deferred acquisition payments	0	(100,000,000)	0
Proceeds from issuance of common stock	0	975,185,000	0
Debt acquisition costs	0	(26,653,000)	0
Other	(13,061,000)	(4,760,000)	(7,087,000)
Net cash provided (utilized) by financing activities	405,949,000	2,810,573,000	(737,101,000)
Effect of exchange rate changes on cash	(12,751,000)	(4,681,000)	(21,282,000)
(Decrease) increase in cash, cash equivalents and restricted cash	(3,130,693,000)	3,397,998,000	(398,863,000)
Cash, cash equivalents and restricted cash at beginning of year	4,580,369,000	1,182,371,000	1,581,234,000
Cash, cash equivalents and restricted cash at end of year	1,449,676,000	4,580,369,000	1,182,371,000
Supplemental information
Interest paid	182,919,000	82,205,000	82,258,000
Income taxes paid	$ 81,573,000	$ 103,149,000	$ 117,854,000