Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 28, 2019	Dec. 29, 2018
Revenues:
Revenue	$ 5,505,788	$ 5,692,598	$ 5,366,325
Costs and expenses:
Cost of Revenue	932,941	1,071,041	937,348
Sales and client service	2,582,615	2,675,337	2,493,696
Software development (Includes amortization of $247,313, $227,414 and $210,228, respectively)	749,007	737,136	683,663
General and administrative	491,586	520,598	389,469
Amortization of acquisition-related intangibles	55,595	87,817	87,364
Total costs and expenses	4,811,744	5,091,929	4,591,540
Gain on sale of businesses	220,523	0	0
Operating earnings	914,567	600,669	774,785
Other income, net	76,906	53,843	26,066
Earnings before income taxes	991,473	654,512	800,851
Income taxes	(211,385)	(125,058)	(170,792)
Net earnings	$ 780,088	$ 529,454	$ 630,059
Basic earnings per share	$ 2.54	$ 1.66	$ 1.91
Diluted earnings per share	$ 2.52	$ 1.65	$ 1.89
Basic weighted average shares outstanding	306,669	318,229	330,084
Diluted weighted average shares outstanding	309,136	321,235	333,572