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Net Income (Loss) Per Share (Tables)
 3 Months Ended
Apr. 30, 2015
Earnings Per Share [Abstract]  
Computation of basic and diluted net income (loss) per share
The following provides the computation of basic and diluted net loss per share:
 
Three months ended April 30,
 
2015
 
2014
Net loss attributable to Mentor Graphics shareholders
$
(9,885
)
 
$
(2,551
)
Adjustment to redemption value of non-controlling interest with redemption feature
269

 
667

Adjusted net loss attributable to Mentor Graphics shareholders
$
(9,616
)
 
$
(1,884
)
Weighted average common shares used to calculate basic net loss per share
116,003

 
114,935

Employee stock options, restricted stock units and employee stock purchase plan
—

 
—

Weighted average common and potential common shares used to calculate diluted net loss per share
116,003

 
114,935

Net loss per share attributable to Mentor Graphics shareholders:
 
 
 
Basic net loss per share
$
(0.08
)
 
$
(0.02
)
Diluted net loss per share
$
(0.08
)
 
$
(0.02
)