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Net Income Per Share (Tables)
 12 Months Ended
Jan. 31, 2013
Notes To Financial Statements [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
The following provides the computation of basic and diluted net income per share:
 
Year ended January 31,
2013
 
2012
 
2011
Net income attributable to Mentor Graphics shareholders
$
138,736

 
$
83,872

 
$
28,584

Noncontrolling interest adjustment to redemption value
(5,272
)
 
—

 
—

Adjusted net income attributable to Mentor Graphics shareholders
$
133,464

 
$
83,872

 
$
28,584

Weighted average common shares used to calculate basic net income per share
110,998

 
110,138

 
107,743

Employee stock options, restricted stock units and employee stock purchase plan
3,019

 
2,777

 
2,118

Weighted average common and potential common shares used to calculate diluted net income per share
114,017

 
112,915

 
109,861

Net income per share attributable to Mentor Graphics shareholders:
 
 
 
 
 
Basic
$
1.20

 
$
0.76

 
$
0.27

Diluted
$
1.17

 
$
0.74

 
$
0.26
Debentures_Had_Been_Dilutive [Table Text Block]
The effect of the conversion of the 4.00% Debentures and the 6.25% Debentures (retired during fiscal 2012) was anti-dilutive and therefore excluded from the computation of diluted net income per share. We assume that the 4.00% Debentures and the 6.25% Debentures will be settled in common stock for purposes of calculating the dilutive effect on net income per share. If the 4.00% Debentures and the 6.25% Debentures had been dilutive we would have included additional income and additional incremental common shares as shown in the following table:
 
Year ended January 31,
2013
 
2012
 
2011
4.00% Debentures
 
 
 
 
 
Additional income
$
2,075

 
$
2,075

 
$
—

Additional incremental common shares (1)
—

 
—

 
—

Year ended January 31,
2013
 
2012
 
2011
6.25% Debentures
 
 
 
 
 
Additional income
$
—

 
$
—

 
$
3,062

Additional incremental common shares (1)
—

 
—

 
—

 
(1) 
Dilutive net income per share would have included no incremental shares for the years ended January 31, 2013, 2012, or 2011 as the stock price was below the conversion rate.