Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Apr. 30, 2015	Apr. 30, 2014
Revenues:
System and software	$ 155,931us-gaap_LicensesRevenue	$ 148,229us-gaap_LicensesRevenue
Service and support	116,212us-gaap_MaintenanceRevenue	103,922us-gaap_MaintenanceRevenue
Total revenues	272,143us-gaap_Revenues	252,151us-gaap_Revenues
Cost of revenues:
System and software	13,624us-gaap_LicenseCosts	26,971us-gaap_LicenseCosts
Service and support	33,569us-gaap_CostOfServicesMaintenanceCosts	29,111us-gaap_CostOfServicesMaintenanceCosts
Amortization of purchased technology	1,858us-gaap_CostOfGoodsSoldAmortization	1,361us-gaap_CostOfGoodsSoldAmortization
Total cost of revenues	49,051us-gaap_CostOfRevenue	57,443us-gaap_CostOfRevenue
Gross profit	223,092us-gaap_GrossProfit	194,708us-gaap_GrossProfit
Operating expenses:
Research and development	89,515	84,451
Marketing and selling	84,951us-gaap_SellingAndMarketingExpense	84,634us-gaap_SellingAndMarketingExpense
General and administration	17,963us-gaap_GeneralAndAdministrativeExpense	17,682us-gaap_GeneralAndAdministrativeExpense
Equity in earnings of Frontline	(870)	(1,379)
Amortization of intangible assets	2,219us-gaap_AmortizationOfIntangibleAssets	1,750us-gaap_AmortizationOfIntangibleAssets
Special charges	36,977us-gaap_RestructuringCharges	5,926us-gaap_RestructuringCharges
Total operating expenses	230,755us-gaap_OperatingExpenses	193,064us-gaap_OperatingExpenses
Operating income (loss)	(7,663)us-gaap_OperatingIncomeLoss	1,644us-gaap_OperatingIncomeLoss
Other income (expense), net	342us-gaap_OtherNonoperatingIncomeExpense	(258)us-gaap_OtherNonoperatingIncomeExpense
Interest expense	(4,694)us-gaap_InterestExpense	(4,585)us-gaap_InterestExpense
Loss before income tax	(12,015)	(3,199)
Income tax expense	(1,512)us-gaap_IncomeTaxExpenseBenefit	(174)us-gaap_IncomeTaxExpenseBenefit
Net loss	(10,503)us-gaap_ProfitLoss	(3,025)us-gaap_ProfitLoss
Less: Loss attributable to noncontrolling interest	(618)	(474)
Net loss attributable to Mentor Graphics shareholders	$ 9,885us-gaap_NetIncomeLoss	$ 2,551us-gaap_NetIncomeLoss
Net loss per share:
Basic	$ (0.08)us-gaap_EarningsPerShareBasic	$ (0.02)us-gaap_EarningsPerShareBasic
Diluted	$ (0.08)us-gaap_EarningsPerShareDiluted	$ (0.02)us-gaap_EarningsPerShareDiluted
Weighted average number of shares outstanding:
Basic	116,003	114,935
Diluted	116,003	114,935
Cash dividends declared per common share	$ 0.055	$ 0.050

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