CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Total revenue	$ 2,621,226	$ 2,266,096	$ 1,857,601
Costs and expenses:
Selling, general and administrative	517,622	443,854	371,266
Amortization of intangible assets	89,538	64,830	41,370
Operating income	351,151	331,383	288,282
Other income (expense):
Interest income	1,522	812	690
Interest expense	(60,882)	(63,772)	(29,777)
Other income, net	12,293	13,258	37,760
Income from continuing operations, before income taxes	304,084	281,681	296,955
Provision for income taxes	50,023	54,463	171,369
Income from continuing operations, net of income taxes	254,061	227,218	125,586
Income (loss) from discontinued operations, net of income taxes	0	1,506	(137)
Net income	254,061	228,724	125,449
Less: Net income attributable to noncontrolling interests	2,042	2,351	2,094
Net income attributable to common shareholders	$ 252,019	$ 226,373	$ 123,355
Basic:
Continuing operations attributable to common shareholders (in dollars per share)	$ 5.17	$ 4.69	$ 2.60
Discontinued operations (in dollars per share)	0	0.03	0
Net income attributable to common shareholders (in dollars per share)	5.17	4.72	2.60
Diluted:
Continuing operations attributable to common shareholders (in dollars per share)	5.07	4.59	2.54
Discontinued operations (in dollars per share)	0	0.03	0
Net income attributable to common shareholders (in dollars per share)	$ 5.07	$ 4.62	$ 2.54
Weighted-average shares outstanding—Basic (in shares)	48,730	47,947	47,481
Weighted-average shares outstanding—Diluted (in shares)	49,693	49,018	48,564
Service
Total revenue	$ 2,029,371	$ 1,687,941	$ 1,298,298
Costs and expenses:
Cost of services provided and products sold	1,371,699	1,150,371	867,014
Product
Total revenue	591,855	578,155	559,303
Costs and expenses:
Cost of services provided and products sold	$ 291,216	$ 275,658	$ 289,669