Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Revenues:
System and software	$ 794,450	$ 700,621	$ 799,151
Service and support	488,017	480,367	444,982
Total revenues	1,282,467	1,180,988	1,244,133
Cost of revenues:
System and software	48,249	48,330	69,811
Service and support	138,651	134,025	127,403
Amortization of purchased technology	7,328	7,303	7,099
Total cost of revenues	194,228	189,658	204,313
Gross profit	1,088,239	991,330	1,039,820
Operating expenses:
Research and development	412,309	381,440	381,125
Marketing and selling	369,125	351,344	365,688
General and administration	85,361	73,853	79,193
Equity in earnings of Frontline	(3,434)	(5,849)	(5,653)
Amortization of intangible assets	6,028	8,716	8,166
Special charges	15,769	45,081	23,490
Total operating expenses	885,158	854,585	852,009
Operating income:	203,081	136,745	187,811
Other income (expense), net	2,249	1,612	(777)
Interest expense	(20,474)	(19,428)	(19,276)
Income before income tax	184,856	118,929	167,758
Income tax expense	29,990	24,753	22,581
Net income	154,866	94,176	145,177
Less: Loss attributable to noncontrolling interest	0	(2,101)	(1,962)
Net income attributable to Mentor Graphics shareholders	$ 154,866	$ 96,277	$ 147,139
Net income per share:
Basic	$ 1.42	$ 0.83	$ 1.28
Diluted	$ 1.37	$ 0.81	$ 1.26
Weighted average number of shares outstanding:
Basic	108,795	116,701	114,635
Diluted	114,322	119,263	117,078
Cash dividends declared per common share	$ 0.22	$ 0.22	$ 0.20