Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Revenues:
System sales	$ 229,925	$ 188,698	$ 651,040	$ 486,222
Support, maintenance and services	432,281	371,467	1,262,231	1,067,791
Reimbursed travel	14,276	11,475	41,781	33,514
Total revenues	676,482	571,640	1,955,052	1,587,527
Costs and expenses:
Cost of system sales	100,668	84,268	318,193	204,254
Cost of support, maintenance and services	34,634	24,721	95,112	71,858
Cost of reimbursed travel	14,276	11,475	41,781	33,514
Sales and client service	259,141	220,177	746,090	631,738
Software development (Includes amortization of $20,880 and $60,353 for the three and nine months ended September 29, 2012; and $20,919 and $59,887 for the three and nine months ended October 1, 2011)	78,094	72,544	222,746	213,478
General and administrative	41,973	38,063	119,912	110,621
Total costs and expenses	528,786	451,248	1,543,834	1,265,463
Operating earnings	147,696	120,392	411,218	322,064
Other income, net	3,351	2,775	8,789	7,666
Earnings before income taxes	151,047	123,167	420,007	329,730
Income taxes	(52,160)	(44,332)	(134,583)	(114,295)
Net earnings	$ 98,887	$ 78,835	$ 285,424	$ 215,435
Basic earnings per share	$ 0.58	$ 0.47	$ 1.67	$ 1.28
Diluted earnings per share	$ 0.56	$ 0.45	$ 1.63	$ 1.24
Basic weighted average shares outstanding	171,251	169,140	170,643	168,343
Diluted weighted average shares outstanding	175,870	174,283	175,517	173,656