Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Net income	$ 41,762	$ 13,889	$ 31,763	$ 33,996
Other comprehensive income (loss), net of tax:
Change in accumulated translation adjustment	(3,245)	(1,698)	1,076	(5,858)
Change in unrealized gain (loss) on derivative instruments	(4)	(408)	19	(49)
Change in pension liability	(29)	(1)	(54)	(5)
Other comprehensive income (loss)	(3,278)	(2,107)	1,041	(5,912)
Comprehensive income	38,484	11,782	32,804	28,084
Net loss attributable to noncontrolling interest	0	(790)	0	(2,010)
Change in accumulated translation adjustment attributable to the noncontrolling interest	0	(16)	0	26
Comprehensive loss attributable to the noncontrolling interest	0	(806)	0	(1,984)
Comprehensive income attributable to Mentor Graphics shareholders	$ 38,484	$ 12,588	$ 32,804	$ 30,068