Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Revenues:
System sales	$ 324,021	$ 301,252	$ 991,685	$ 913,710
Support, maintenance and services	927,829	861,085	2,763,483	2,561,474
Reimbursed travel	24,157	22,220	73,319	63,470
Total revenues	1,276,007	1,184,557	3,828,487	3,538,654
Costs and expenses:
Cost of system sales	105,200	93,275	322,884	296,336
Cost of support, maintenance and services	73,547	67,475	228,757	204,313
Cost of reimbursed travel	24,157	22,220	73,319	63,470
Sales and client service	564,621	512,671	1,688,208	1,534,763
Software development (Includes amortization of $44,358 and $126,346 for the three and nine months ended September 30, 2017, respectively; and $35,552 and $102,429 for the three and nine months ended October 1, 2016, respectively)	153,834	136,755	442,570	405,451
General and administrative	84,178	87,071	263,203	267,232
Amortization of acquisition-related intangibles	22,564	22,865	68,126	68,104
Total costs and expenses	1,028,101	942,332	3,087,067	2,839,669
Operating earnings	247,906	242,225	741,420	698,985
Other income (expense), net	2,509	(417)	4,054	3,734
Earnings before income taxes	250,415	241,808	745,474	702,719
Income taxes	(72,991)	(71,829)	(215,154)	(215,926)
Net earnings	$ 177,424	$ 169,979	$ 530,320	$ 486,793
Basic earnings per share	$ 0.53	$ 0.50	$ 1.60	$ 1.44
Diluted earnings per share	$ 0.52	$ 0.49	$ 1.57	$ 1.41
Basic weighted average shares outstanding	331,993	338,684	331,319	338,675
Diluted weighted average shares outstanding	338,780	344,817	337,946	344,917