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Quarterly Financial Information - Unaudited (Tables)
 12 Months Ended
Jan. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
A summary of quarterly financial information follows:
Quarter ended
April 30
 
July 31
 
October 31
 
January 31
Fiscal Year 2016
 
 
 
 
 
 
 
Total revenues
$
272,143

 
$
281,062

 
$
290,516

 
$
337,267

Gross profit
$
223,092

 
$
234,799

 
$
243,627

 
$
289,812

Operating income (loss)
$
(7,663
)
 
$
39,266

 
$
25,688

 
$
79,454

Net income (loss) attributable to Mentor Graphics shareholders
$
(9,885
)
 
$
31,212

 
$
14,679

 
$
60,271

Net income (loss) per share, basic (1)
$
(0.08
)
 
$
0.27

 
$
0.13

 
$
0.52

Net income (loss) per share, diluted (1)
$
(0.08
)
 
$
0.26

 
$
0.12

 
$
0.51

 
 
 
 
 
 
 
 
Fiscal Year 2015
 
 
 
 
 
 
 
Total revenues
$
252,151

 
$
260,233

 
$
292,683

 
$
439,066

Gross profit
$
194,708

 
$
211,304

 
$
245,142

 
$
388,666

Operating income
$
1,644

 
$
16,912

 
$
29,723

 
$
139,532

Net income (loss) attributable to Mentor Graphics shareholders
$
(2,551
)
 
$
14,172

 
$
21,030

 
$
114,488

Net income (loss) per share, basic (1)
$
(0.02
)
 
$
0.13

 
$
0.18

 
$
0.98

Net income (loss) per share, diluted (1)
$
(0.02
)
 
$
0.13

 
$
0.18

 
$
0.96


(1) 
We have adjusted the numerator of our basic and diluted earnings per share calculation for the adjustment of the noncontrolling interest with redemption feature to its calculated redemption value, recorded directly to retained earnings, as follows:
Quarter ended
April 30
 
July 31
 
October 31
 
January 31
Fiscal Year 2016
$
269

 
$
(144
)
 
$
133

 
$
—

Fiscal Year 2015
$
667

 
$
895

 
$
(267
)
 
$
(1,174
)