Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Revenues:
System and software	$ 168,699	$ 178,115	$ 486,831	$ 475,824
Service and support	121,817	114,568	356,890	329,243
Total revenues	290,516	292,683	843,721	805,067
Cost of revenues:
System and software	9,759	11,821	36,432	54,977
Service and support	35,286	33,670	100,275	93,684
Amortization of purchased technology	1,844	2,050	5,496	5,252
Total cost of revenues	46,889	47,541	142,203	153,913
Gross profit	243,627	245,142	701,518	651,154
Operating expenses:
Research and development	99,669	96,269	278,237	268,262
Marketing and selling	93,165	89,875	262,857	256,814
General and administration	19,665	19,851	56,298	57,006
Equity in earnings of Frontline	(1,755)	(1,184)	(3,976)	(4,625)
Amortization of intangible assets	2,364	2,233	6,817	6,009
Special charges	4,831	8,375	43,994	19,409
Total operating expenses	217,939	215,419	644,227	602,875
Operating income:	25,688	29,723	57,291	48,279
Other income (expense), net	320	(381)	849	(743)
Interest expense	(4,915)	(4,934)	(14,381)	(14,326)
Income before income tax	21,093	24,408	43,759	33,210
Income tax expense	7,204	3,849	9,763	1,907
Net income	13,889	20,559	33,996	31,303
Less: Loss attributable to noncontrolling interest	(790)	(471)	(2,010)	(1,348)
Net income attributable to Mentor Graphics shareholders	$ 14,679	$ 21,030	$ 36,006	$ 32,651
Net income per share:
Basic	$ 0.13	$ 0.18	$ 0.31	$ 0.30
Diluted	$ 0.12	$ 0.18	$ 0.30	$ 0.29
Weighted average number of shares outstanding:
Basic	117,759	114,405	116,787	114,399
Diluted	120,141	116,715	121,963	116,928
Cash dividends declared per common share	$ 0.055	$ 0.050	$ 0.165	$ 0.150