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Stockholder's Equity (Details 4) - Stock Options	12 Months Ended
	Jul. 31, 2019 $ / shares shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number Outstanding at July 31, 2019 (in shares) | shares	14,552,000
Weighted-Average Remaining Contractual Life	6 years 14 days
Weighted- Average Exercise Price, Options Outstanding	$ 26.29
Number Exercisable at July 31, 2019 (in shares) | shares	10,343,000
Weighted-Average Exercise Price, Options Exercisable	$ 19.77
$8.28–$17.64
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price lower range	8.28
Exercise price upper range	$ 17.64
Number Outstanding at July 31, 2019 (in shares) | shares	891,000
Weighted-Average Remaining Contractual Life	2 years 7 months 6 days
Weighted- Average Exercise Price, Options Outstanding	$ 11.94
Number Exercisable at July 31, 2019 (in shares) | shares	871,000
Weighted-Average Exercise Price, Options Exercisable	$ 11.82
$17.73–$17.81
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price lower range	17.73
Exercise price upper range	$ 17.81
Number Outstanding at July 31, 2019 (in shares) | shares	6,110,000
Weighted-Average Remaining Contractual Life	4 years 10 months 13 days
Weighted- Average Exercise Price, Options Outstanding	$ 17.78
Number Exercisable at July 31, 2019 (in shares) | shares	5,592,000
Weighted-Average Exercise Price, Options Exercisable	$ 17.79
$18.06–$34.78
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price lower range	18.06
Exercise price upper range	$ 34.78
Number Outstanding at July 31, 2019 (in shares) | shares	4,208,000
Weighted-Average Remaining Contractual Life	6 years 2 months 23 days
Weighted- Average Exercise Price, Options Outstanding	$ 23.16
Number Exercisable at July 31, 2019 (in shares) | shares	3,289,000
Weighted-Average Exercise Price, Options Exercisable	$ 21.52
$36.32–$77.51
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price lower range	36.32
Exercise price upper range	$ 77.51
Number Outstanding at July 31, 2019 (in shares) | shares	3,343,000
Weighted-Average Remaining Contractual Life	8 years 10 months 2 days
Weighted- Average Exercise Price, Options Outstanding	$ 49.60
Number Exercisable at July 31, 2019 (in shares) | shares	591,000
Weighted-Average Exercise Price, Options Exercisable	$ 40.57

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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-Publisher FASB
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-Topic 718
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-Section 50
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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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