Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Net income	$ 20,559	$ 25,123	$ 31,303	$ 48,451
Other comprehensive income (loss), net of tax:
Change in unrealized gain (loss) on derivative instruments	(145)	211	(294)	(59)
Less: reclassification adjustment for net income (loss) included in net income	(165)	209	(248)	(58)
Net change	20	2	(46)	(1)
Change in accumulated translation adjustment	(11,790)	3,947	(12,493)	(3,489)
Change in pension liability	(2)	(2)	(6)	(6)
Other comprehensive income (loss)	(11,772)	3,947	(12,545)	(3,496)
Comprehensive income	8,787	29,070	18,758	44,955
Net loss attributable to noncontrolling interest	(471)	(412)	(1,348)	(1,271)
Change in accumulated translation adjustment attributable to the noncontrolling interest	3	(46)	8	2
Comprehensive loss attributable to the noncontrolling interest	(468)	(458)	(1,340)	(1,269)
Comprehensive income attributable to Mentor Graphics shareholders	$ 9,255	$ 29,528	$ 20,098	$ 46,224