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Quarterly Financial Information - Unaudited (Tables)
12 Months Ended
Jan. 31, 2013
Notes To Financial Statements [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
A summary of quarterly financial information follows:
 
Quarter ended
April 30
 
July 31
 
October 31
 
January 31
Fiscal 2013
 
 
 
 
 
 
 
Total revenues
$
247,918

 
$
240,811

 
$
268,760

 
$
331,238

Gross profit
$
202,535

 
$
194,235

 
$
218,497

 
$
283,770

Operating income
$
32,822

 
$
19,907

 
$
37,809

 
$
71,095

Net income attributable to Mentor Graphics shareholders
$
28,182

 
$
18,167

 
$
30,641

 
$
61,746

Net income per share, basic (1)
$
0.26

 
$
0.17

 
$
0.27

 
$
0.50

Net income per share, diluted (1)
$
0.25

 
$
0.16

 
$
0.27

 
$
0.49

Quarter ended
April 30
 
July 31
 
October 31
 
January 31
Fiscal 2012
 
 
 
 
 
 
 
Total revenues
$
230,035

 
$
213,740

 
$
250,508

 
$
320,355

Gross profit
$
185,390

 
$
169,848

 
$
210,262

 
$
275,680

Operating income
$
16,173

 
$
4,844

 
$
25,405

 
$
65,770

Net income (loss) attributable to Mentor Graphics shareholders
$
(2,353
)
 
$
4,334

 
$
24,071

 
$
57,820

Net income (loss) per share, basic
$
(0.02
)
 
$
0.04

 
$
0.22

 
$
0.53

Net income (loss) per share, diluted
$
(0.02
)
 
$
0.04

 
$
0.22

 
$
0.52