Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Revenues:
System and software	$ 133,755	$ 162,201	$ 240,459	$ 318,132
Service and support	120,589	118,861	241,524	235,073
Total revenues	254,344	281,062	481,983	553,205
Cost of revenues:
System and software	15,330	13,049	23,662	26,673
Service and support	32,513	31,420	65,261	64,989
Amortization of purchased technology	1,787	1,794	3,572	3,652
Total cost of revenues	49,630	46,263	92,495	95,314
Gross profit	204,714	234,799	389,488	457,891
Operating expenses:
Research and development	93,402	89,053	184,538	178,568
Marketing and selling	83,911	84,741	168,170	169,692
General and administration	19,227	18,670	36,762	36,633
Equity in earnings of Frontline	(1,041)	(1,351)	(1,677)	(2,221)
Amortization of intangible assets	1,520	2,234	3,074	4,453
Special charges	1,445	2,186	4,436	39,163
Total operating expenses	198,464	195,533	395,303	426,288
Operating income (loss):	6,250	39,266	(5,815)	31,603
Other income	638	187	1,527	529
Interest expense	(5,690)	(4,772)	(9,828)	(9,466)
Income (loss) before income tax	1,198	34,681	(14,116)	22,666
Income tax expense (benefit)	(2,239)	4,071	(4,117)	2,559
Net income (loss)	3,437	30,610	(9,999)	20,107
Less: Loss attributable to noncontrolling interest	0	(602)	0	(1,220)
Net income (loss) attributable to Mentor Graphics shareholders	$ 3,437	$ 31,212	$ (9,999)	$ 21,327
Net income (loss) per share:
Basic	$ 0.03	$ 0.27	$ (0.09)	$ 0.18
Diluted	$ 0.03	$ 0.26	$ (0.09)	$ 0.18
Weighted average number of shares outstanding:
Basic	107,374	116,584	108,215	116,296
Diluted	109,874	119,368	108,215	118,986
Cash dividends declared per common share	$ 0.055	$ 0.055	$ 0.110	$ 0.110