Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Net income	$ 153,558	$ 138,634	$ 83,387
Other comprehensive loss, net of tax:
Change in unrealized gain (loss) on derivative instruments	1,653	829	(402)
Cash flow hedge reclassification adjustment for net gain (loss) included in net income	1,599	636	(199)
Cash flow hedges change net of tax expense (benefit)	54	193	(203)
Less: reclassification adjustment for net gain (loss) included in net income	(6,790)	(3,110)	(3,149)
Change in pension liability, net of tax expense (benefit)	135	(420)	212
Other comprehensive loss	(6,601)	(3,337)	(3,140)
Comprehensive income	146,957	135,297	80,247
Net income (loss) attributable to noncontrolling interest	(1,700)	(102)	(485)
Change in accumulated translation adjustment attributable to noncontrolling interest	(5)	(56)	(127)
Comprehensive loss attributable to the noncontrolling interest	(1,705)	(158)	(612)
Comprehensive income attributable to Mentor Graphics shareholders	$ 148,662	$ 135,455	$ 80,859