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Description of Business and Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jan. 31, 2018
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,
2018
 
January 31,
2017
 
January 31,
2018
 
January 31,
2017
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
(21
)
 
$
13

 
$
(38
)
 
$
(17
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Shares used in basic per share amounts:
 
 
 
 
 
 
 
Weighted average common shares outstanding
256

 
257

 
256

 
257

 
 
 
 
 
 
 
 
Shares used in diluted per share amounts:
 
 
 
 
 
 
 
Weighted average common shares outstanding
256

 
257

 
256

 
257

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

 
3

 
—

 
—

Dilutive weighted average common shares outstanding
256

 
260

 
256

 
257

 
 
 
 
 
 
 
 
Basic and diluted net income (loss) per share:
 
 
 
 
 
 
 
Basic net income (loss) per share
$
(0.08
)
 
$
0.05

 
$
(0.15
)
 
$
(0.07
)
 
 
 
 
 
 
 
 
Diluted net income (loss) per share
$
(0.08
)
 
$
0.05

 
$
(0.15
)
 
$
(0.07
)
 
 
 
 
 
 
 
 
Shares excluded from diluted net income (loss) per share:
 
 
 
 
 
 
 
Weighted average stock options and restricted stock units that have been excluded from dilutive common equivalent shares outstanding due to their anti-dilutive effect
13

 
4

 
14

 
15