Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Revenues:
System and software	$ 162,201	$ 149,480	$ 318,132	$ 297,709
Service and support	118,861	110,753	235,073	214,675
Total revenues	281,062	260,233	553,205	512,384
Cost of revenues:
System and software	13,049	16,185	26,673	43,156
Service and support	31,420	30,903	64,989	60,014
Amortization of purchased technology	1,794	1,841	3,652	3,202
Total cost of revenues	46,263	48,929	95,314	106,372
Gross profit	234,799	211,304	457,891	406,012
Operating expenses:
Research and development	89,053	87,542	178,568	171,993
Marketing and selling	84,741	82,305	169,692	166,939
General and administration	18,670	19,473	36,633	37,155
Equity in earnings of Frontline	(1,351)	(2,062)	(2,221)	(3,441)
Amortization of intangible assets	2,234	2,026	4,453	3,776
Special charges	2,186	5,108	39,163	11,034
Total operating expenses	195,533	194,392	426,288	387,456
Operating income	39,266	16,912	31,603	18,556
Other income (expense), net	187	(104)	529	(362)
Interest expense	(4,772)	(4,807)	(9,466)	(9,392)
Income before income tax	34,681	12,001	22,666	8,802
Income tax expense (benefit)	4,071	(1,768)	2,559	(1,942)
Net income	30,610	13,769	20,107	10,744
Less: Loss attributable to noncontrolling interest	(602)	(403)	(1,220)	(877)
Net income attributable to Mentor Graphics shareholders	$ 31,212	$ 14,172	$ 21,327	$ 11,621
Net income per share:
Basic	$ 0.27	$ 0.13	$ 0.18	$ 0.12
Diluted	$ 0.26	$ 0.13	$ 0.18	$ 0.11
Weighted average number of shares outstanding:
Basic	116,584	113,868	116,296	114,396
Diluted	119,368	116,551	118,986	116,960
Cash dividends declared per common share	$ 0.055	$ 0.050	$ 0.110	$ 0.100