Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Revenues:
Revenues	$ 1,340,073	$ 1,276,007	$ 4,000,661	$ 3,828,487
Costs and expenses:
Costs of revenue	230,332	202,904	700,393	624,960
Sales and client service	605,946	564,621	1,830,999	1,688,208
Software development (Includes amortization of $53,429 and $155,571 for the three and nine months ended September 29, 2018, respectively; and $44,358 and $126,346 for the three and nine months ended September 30, 2017, respectively)	172,297	153,834	502,192	442,570
General and administrative	102,789	84,178	290,547	263,203
Amortization of acquisition-related intangibles	21,553	22,564	65,872	68,126
Total costs and expenses	1,132,917	1,028,101	3,390,003	3,087,067
Operating earnings	207,156	247,906	610,658	741,420
Other income (expense), net	6,943	2,509	18,404	4,054
Earnings before income taxes	214,099	250,415	629,062	745,474
Income taxes	(44,718)	(72,991)	(130,323)	(215,154)
Net earnings	$ 169,381	$ 177,424	$ 498,739	$ 530,320
Basic earnings per share	$ 0.51	$ 0.53	$ 1.51	$ 1.60
Diluted earnings per share	$ 0.51	$ 0.52	$ 1.49	$ 1.57
Basic weighted average shares outstanding	329,342	331,993	330,789	331,319
Diluted weighted average shares outstanding	332,937	338,780	334,493	337,946