Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Revenues:
System sales	$ 195,295	$ 157,145	$ 421,115	$ 297,524
Support, maintenance and services	426,046	355,330	829,950	696,324
Reimbursed travel	16,017	11,748	27,505	22,039
Total revenues	637,358	524,223	1,278,570	1,015,887
Costs and expenses:
Cost of system sales	100,570	61,887	217,525	119,986
Cost of support, maintenance and services	30,913	24,847	60,478	47,137
Cost of reimbursed travel	16,017	11,748	27,505	22,039
Sales and client service	241,875	210,213	486,949	411,561
Software development (Includes amortization of $20,084 and $39,473 for the three and six months ended June 30, 2012; and $19,910 and $38,968 for the three and six months ended July 2, 2011)	73,507	69,790	144,652	140,934
General and administrative	38,393	37,765	77,939	72,558
Total costs and expenses	501,275	416,250	1,015,048	814,215
Operating earnings	136,083	107,973	263,522	201,672
Other income, net	2,814	2,880	5,438	4,891
Earnings before income taxes	138,897	110,853	268,960	206,563
Income taxes	(41,068)	(38,809)	(82,423)	(69,963)
Net earnings	$ 97,829	$ 72,044	$ 186,537	$ 136,600
Basic earnings per share	$ 0.57	$ 0.43	$ 1.10	$ 0.81
Diluted earnings per share	$ 0.56	$ 0.42	$ 1.06	$ 0.79
Basic weighted average shares outstanding	170,713	168,299	170,336	167,706
Diluted weighted average shares outstanding	175,634	173,591	175,333	173,128