Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Net income (loss)	$ 3,437	$ 30,610	$ (9,999)	$ 20,107
Other comprehensive income (loss), net of tax:
Change in accumulated translation adjustment	(4,165)	(4,777)	4,321	(4,160)
Change in unrealized gain (loss) on derivative instruments	(7)	420	23	359
Change in pension liability	(28)	(2)	(25)	(4)
Other comprehensive income (loss)	(4,200)	(4,359)	4,319	(3,805)
Comprehensive income (loss)	(763)	26,251	(5,680)	16,302
Net loss attributable to noncontrolling interest	0	(602)	0	(1,220)
Change in accumulated translation adjustment attributable to the noncontrolling interest	0	(8)	0	42
Comprehensive loss attributable to the noncontrolling interest	0	(610)	0	(1,178)
Comprehensive income (loss) attributable to Mentor Graphics shareholders	$ (763)	$ 26,861	$ (5,680)	$ 17,480