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Selected Quarterly Financial Data (Tables)
 12 Months Ended
Jul. 31, 2013
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
 
Fiscal 2013 Quarter Ended
(In millions, except per share amounts)
October 31
 
January 31
 
   April 30   

 
    July 31    

 
 
 
 
 
 
 
 
Total net revenue
$
562

 
$
884

 
$
2,091

 
$
634

Cost of revenue
139

 
166

 
145

 
127

All other costs and expenses
496

 
634

 
664

 
567

Operating income (loss) from continuing operations
(73
)
 
84

 
1,282

 
(60
)
Net income (loss) from continuing operations
(54
)
 
65

 
858

 
(46
)
Net income (loss) from discontinued operations
35

 
6

 
(36
)
 
30

Net income (loss)
(19
)
 
71

 
822

 
(16
)
 
 
 
 
 
 
 
 
Basic net income (loss) per share from continuing operations
$
(0.18
)
 
$
0.22

 
$
2.89

 
$
(0.15
)
Basic net income (loss) per share from discontinued operations
0.12

 
0.02

 
(0.12
)
 
0.10

Basic net income (loss) per share
$
(0.06
)
 
$
0.24

 
$
2.77

 
$
(0.05
)
 
 
 
 
 
 
 
 
Diluted net income (loss) per share from continuing operations
$
(0.18
)
 
$
0.21

 
$
2.83

 
$
(0.15
)
Diluted net income (loss) per share from discontinued operations
0.12

 
0.02

 
(0.12
)
 
0.10

Diluted net income (loss) per share
$
(0.06
)
 
$
0.23

 
$
2.71

 
$
(0.05
)



 
Fiscal 2012 Quarter Ended
(In millions, except per share amounts)
October 31
 
January 31
 
   April 30   

 
    July 31     

 
 
 
 
 
 
 
 
Total net revenue
$
491

 
$
911

 
$
1,839

 
$
567

Cost of revenue
123

 
162

 
154

 
146

All other costs and expenses
448

 
556

 
583

 
468

Operating income (loss) from continuing operations
(80
)
 
193

 
1,102

 
(47
)
Net income (loss) from continuing operations
(55
)
 
119

 
732

 
(32
)
Net income (loss) from discontinued operations
(9
)
 
(1
)
 
2

 
36

Net income (loss)
(64
)
 
118

 
734

 
4

 
 
 
 
 
 
 
 
Basic net income (loss) per share from continuing operations
$
(0.18
)
 
$
0.40

 
$
2.48

 
$
(0.11
)
Basic net income (loss) per share from discontinued operations
(0.03
)
 
—

 
0.01

 
0.12

Basic net income (loss) per share
$
(0.21
)
 
$
0.40

 
$
2.49

 
$
0.01

 
 
 
 
 
 
 
 
Diluted net income (loss) per share from continuing operations
$
(0.18
)
 
$
0.39

 
$
2.41

 
$
(0.11
)
Diluted net income (loss) per share from discontinued operations
(0.03
)
 
—

 
0.01

 
0.12

Diluted net income (loss) per share
$
(0.21
)
 
$
0.39

 
$
2.42

 
$
0.01