Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011	Oct. 31, 2010
Revenues:
System and software	$ 154,363	$ 148,101	$ 411,503	$ 346,042
Service and support	96,145	90,836	282,780	261,406
Total revenues	250,508	238,937	694,283	607,448
Cost of revenues:
System and software	10,864	14,261	41,235	28,881
Service and support	27,621	25,430	79,676	72,230
Amortization of purchased technology	1,761	3,299	7,872	10,428
Total cost of revenues	40,246	42,990	128,783	111,539
Gross margin	210,262	195,947	565,500	495,909
Operating expenses:
Research and development	81,305	73,622	220,578	208,058
Marketing and selling	83,036	80,591	236,718	225,135
General and administration	17,922	18,485	52,055	55,527
Equity in losses (earnings) of Frontline	134	(415)	(2,022)	(1,761)
Amortization of intangible assets	1,296	1,445	4,361	5,742
Special charges	1,164	1,578	7,388	8,052
Total operating expenses	184,857	175,306	519,078	500,753
Operating income (loss)	25,405	20,641	46,422	(4,844)
Other income (expense), net	1,836	(206)	1,890	(1,361)
Interest expense	(4,615)	(4,324)	(26,689)	(13,378)
Income (loss) before income tax	22,626	16,111	21,623	(19,583)
Income tax expense (benefit)	(1,445)	854	(4,429)	2,432
Net income (loss)	$ 24,071	$ 15,257	$ 26,052	$ (22,015)
Net income (loss) per share:
Basic	$ 0.22	$ 0.14	$ 0.24	$ (0.21)
Diluted	$ 0.22	$ 0.14	$ 0.23	$ (0.21)
Weighted average number of shares outstanding:
Basic	109,501	109,364	110,423	106,942
Diluted	111,563	112,139	113,181	106,942