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Stockholder's Equity (Details 2) - Stock Options - $ / shares	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Number Of Shares [Roll Forward]
Non-vested shares at July 31,	6,667,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	2,383,000
Vested (in shares)	(3,376,000)
Forfeitures or expirations (in shares)	(158,000)
Non-vested shares at July 31,	5,516,000	6,667,000
Weighted Average Grant Date Fair Value [Roll Forward]
Grants of non-vested shares, fair value	$ 8.88	$ 7.05	$ 5.04
Vested, fair value	5.67
Forfeitures or expirations, fair value	4.89
Non-vested shares at July 31, 2018, fair value	$ 6.96	$ 5.57

X

- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)-(4)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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X

- Definition

Number of non-vested options outstanding.

+ References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Weighted average grant-date fair value of non-vested options forfeited.

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- Definition

Weighted average grant-date fair value of non-vested options outstanding.

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Number of options vested.

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- Definition

Weighted average grant-date fair value of options vested.

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