CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Cash flows relating to operating activities
Net income	$ 398,837	$ 365,306	$ 254,061
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	265,540	234,924	198,095
Stock-based compensation	71,474	56,341	57,271
Loss on debt extinguishment and other financing costs	29,964	3,661	4,943
Deferred income taxes	(24,006)	(133)	(21,895)
Loss (gain) on venture capital and strategic equity investments, net	30,420	(100,861)	(20,706)
Gain on sale of businesses	(25,026)	0	0
Contingent consideration	(34,303)	(468)	0
Other, net	4,957	14,080	2,988
Changes in assets and liabilities:
Trade receivables and contract assets, net	(26,633)	(85,627)	(8,323)
Inventories	(25,159)	(18,379)	(21,399)
Accounts payable	44,901	748	29,775
Accrued compensation	44,304	40,481	3,394
Deferred revenue	(13,402)	28,647	(3,620)
Customer contract deposits	16,925	8,955	(10,898)
Other assets and liabilities, net	2,006	(1,100)	17,250
Net cash provided by operating activities	760,799	546,575	480,936
Cash flows relating to investing activities
Acquisition of businesses and assets, net of cash acquired	(1,293,095)	(418,628)	(515,701)
Capital expenditures	(228,772)	(166,560)	(140,514)
Purchases of investments and contributions to venture capital investments	(45,555)	(26,692)	(22,341)
Proceeds from sale of businesses, net	122,694	0	0
Proceeds from sale of investments	6,532	11,401	942
Other, net	264	(1,065)	(3,888)
Net cash used in investing activities	(1,437,932)	(601,544)	(681,502)
Cash flows relating to financing activities
Proceeds from long-term debt and revolving credit facility	6,951,113	2,230,988	3,358,461
Proceeds from exercises of stock options	45,652	46,586	34,546
Payments on long-term debt, revolving credit facility, and finance lease obligations	(6,242,877)	(2,200,400)	(3,124,588)
Payment of debt extinguishment and financing costs	(38,255)	0	(6,593)
Purchase of treasury stock	(40,707)	(23,979)	(18,087)
Other, net	(2,328)	(5,947)	(11,802)
Net cash provided by financing activities	672,598	47,248	231,937
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	17,730	794	11,357
Net change in cash, cash equivalents, and restricted cash	13,195	(6,927)	42,728
Cash, cash equivalents, and restricted cash, beginning of period	233,119	240,046	197,318
Cash, cash equivalents, and restricted cash, end of period	246,314	233,119	240,046
Supplemental cash flow information:
Cash and cash equivalents	241,214	228,424	238,014
Restricted cash included in Other current assets	4,023	3,074	431
Restricted cash included in Other assets	1,077	1,621	1,601
Cash, cash equivalents, and restricted cash, end of period	246,314	233,119	240,046
Cash paid for income taxes	75,441	60,059	54,060
Cash paid for interest	70,775	72,461	67,813
Non-cash investing and financing activities:
Purchases of Property, plant and equipment included in Accounts payable and Accrued liabilities	72,043	25,614	21,447
Assets acquired under finance leases	$ 1,567	$ 1,571	$ 4,819