Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Revenues:
System and software	$ 149,480	$ 150,203	$ 297,709	$ 273,487
Service and support	110,753	103,013	214,675	206,244
Total revenues	260,233	253,216	512,384	479,731
Cost of revenues:
System and software	16,185	15,236	43,156	24,135
Service and support	30,903	28,909	60,014	58,984
Amortization of purchased technology	1,841	712	3,202	1,919
Total cost of revenues	48,929	44,857	106,372	85,038
Gross profit	211,304	208,359	406,012	394,693
Operating expenses:
Research and development	87,542	80,307	171,993	160,024
Marketing and selling	82,305	79,811	166,939	158,918
General and administration	19,473	17,198	37,155	33,535
Equity in earnings of Frontline	(2,062)	(950)	(3,441)	(1,347)
Amortization of intangible assets	2,026	1,556	3,776	3,210
Special charges	5,108	3,859	11,034	7,882
Total operating expenses	194,392	181,781	387,456	362,222
Operating income	16,912	26,578	18,556	32,471
Other income (expense), net	(104)	(272)	(362)	(1,231)
Interest expense	(4,807)	(4,897)	(9,392)	(9,682)
Income before income taxes	12,001	21,409	8,802	21,558
Income tax benefit	(1,768)	(2,338)	(1,942)	(1,770)
Net income	13,769	23,747	10,744	23,328
Net loss attributable to noncontrolling interest	(403)	(235)	(877)	(859)
Net income attributable to Mentor Graphics shareholders	$ 14,172	$ 23,982	$ 11,621	$ 24,187
Net income per share:
Basic	$ 0.13	$ 0.19	$ 0.12	$ 0.20
Diluted	$ 0.13	$ 0.19	$ 0.11	$ 0.19
Weighted average number of shares outstanding:
Basic	113,868	112,988	114,396	112,851
Diluted	116,551	116,295	116,960	116,014
Cash dividends declared per common share	$ 0.050	$ 0.045	$ 0.100	$ 0.090