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Description of Business and Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jan. 31, 2017
Accounting Policies [Abstract]  
Composition of shares used in the computation of basic and diluted net income per share The following table presents the composition of shares used in the computation of basic and diluted net income (loss) per share for the periods indicated.
 
Three Months Ended
 
Six Months Ended
(In millions, except per share amounts)
January 31,
2017
 
January 31,
2016
 
January 31,
2017
 
January 31,
2016
Numerator:
 
 
 
 
 
 
 
Net income (loss) from continuing operations
$
13

 
$
29

 
$
(17
)
 
$
(2
)
Net loss from discontinued operations
—

 
(5
)
 
—

 
(5
)
Net income (loss)
$
13

 
$
24

 
$
(17
)
 
$
(7
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Shares used in basic per share amounts:
 
 
 
 
 
 
 
Weighted average common shares outstanding
257

 
263

 
257

 
267

 
 
 
 
 
 
 
 
Shares used in diluted per share amounts:
 
 
 
 
 
 
 
Weighted average common shares outstanding
257

 
263

 
257

 
267

Dilutive common equivalent shares from stock options
 
 
 
 
 
 
 
and restricted stock awards
3

 
3

 
—

 
—

Dilutive weighted average common shares outstanding
260

 
266

 
257

 
267

 
 
 
 
 
 
 
 
Basic and diluted net income (loss) per share:
 
 
 
 
 
 
 
Basic net income (loss) per share from continuing operations
$
0.05

 
$
0.11

 
$
(0.07
)
 
$
(0.01
)
Basic net loss per share from discontinued operations
—

 
(0.02
)
 
—

 
(0.02
)
Basic net income (loss) per share
$
0.05

 
$
0.09

 
$
(0.07
)
 
$
(0.03
)
 
 
 
 
 
 
 
 
Diluted net income (loss) per share from continuing operations
$
0.05

 
$
0.11

 
$
(0.07
)
 
$
(0.01
)
Diluted net loss per share from discontinued operations
—

 
(0.02
)
 
—

 
(0.02
)
Diluted net income (loss) per share
$
0.05

 
$
0.09

 
$
(0.07
)
 
$
(0.03
)
 
 
 
 
 
 
 
 
Shares excluded from computation of diluted net income (loss) per share:
 
 
 
 
 
 
 
Weighted average stock options and restricted stock units that would have been included in the computation of dilutive common equivalent shares outstanding if net income had been reported in the period
—

 
—

 
11

 
13

 
 
 
 
 
 
 
 
Weighted average stock options and restricted stock units excluded from computation due to anti-dilutive effect
4

 
2

 
4

 
2