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Selected Quarterly Financial Data (Tables)
 12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Quarterly Financial Information Disclosure [Abstract]    
Schedule of Quarterly Financial Information
 
Fiscal 2012 Quarter Ended
(In millions, except per share amounts)
October 31
 
January 31
 
   April 30   

 
    July 31    

 
 
 
 
 
 
 
 
Total net revenue
$
575

 
$
999

 
$
1,926

 
$
651

Cost of revenue
167

 
205

 
197

 
191

All other costs and expenses
492

 
599

 
618

 
505

Operating income (loss) from continuing operations
(84
)
 
195

 
1,111

 
(45
)
Net income (loss) from continuing operations
(58
)
 
121

 
736

 
(32
)
Net income (loss) from discontinued operations
(6
)
 
(3
)
 
(2
)
 
36

Net income (loss)
(64
)
 
118

 
734

 
4

 
 
 
 
 
 
 
 
Basic net income (loss) per share from continuing operations
$
(0.19
)
 
$
0.41

 
$
2.50

 
$
(0.11
)
Basic net income (loss) per share from discontinued operations
(0.02
)
 
(0.01
)
 
(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
$
(0.19
)
 
$
0.40

 
$
2.43

 
$
(0.11
)
Diluted net income (loss) per share from discontinued operations
(0.02
)
 
(0.01
)
 
(0.01
)
 
0.12

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

 
$
2.42

 
$
0.01
 
Fiscal 2011 Quarter Ended
(In millions, except per share amounts)
October 31
 
January 31
 
   April 30   

 
    July 31     

 
 
 
 
 
 
 
 
Total net revenue
$
515

 
$
857

 
$
1,827

 
$
573

Cost of revenue
154

 
175

 
162

 
159

All other costs and expenses
455

 
560

 
598

 
472

Operating income (loss) from continuing operations
(94
)
 
122

 
1,067

 
(58
)
Net income (loss) from continuing operations
(64
)
 
80

 
692

 
(56
)
Net income (loss) from discontinued operations
(6
)
 
(7
)
 
(4
)
 
(1
)
Net income (loss)
(70
)
 
73

 
688

 
(57
)
 
 
 
 
 
 
 
 
Basic net income (loss) per share from continuing operations
$
(0.20
)
 
$
0.26

 
$
2.28

 
$
(0.19
)
Basic net income (loss) per share from discontinued operations
(0.02
)
 
(0.02
)
 
(0.01
)
 
—

Basic net income (loss) per share
$
(0.22
)
 
$
0.24

 
$
2.27

 
$
(0.19
)
 
 
 
 
 
 
 
 
Diluted net income (loss) per share from continuing operations
$
(0.20
)
 
$
0.25

 
$
2.21

 
$
(0.19
)
Diluted net income (loss) per share from discontinued operations
(0.02
)
 
(0.02
)
 
(0.01
)
 
—

Diluted net income (loss) per share
$
(0.22
)
 
$
0.23

 
$
2.20

 
$
(0.19
)