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Stockholder's Equity (Details 2) - Stock Options - $ / shares	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	2,891,000
Number Of Shares [Roll Forward]
Non-vested shares at July 31, 2014	5,921,000
Vested (in shares)	(1,984,000)
Forfeitures or expirations (in shares)	(213,000)
Non-vested shares at July 31, 2015	6,615,000	5,921,000
Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested shares at July 31, 2014, fair value	$ 10.39
Grants of non-vested shares, fair value	10.18	$ 11.10	$ 7.87
Vested, fair value	9.83
Forfeitures or expirations, fair value	10.37
Non-vested shares at July 31, 2015, fair value	$ 10.48	$ 10.39

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- 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://www.xbrl.org/2003/role/presentationRef



-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=6415400&loc=d3e5070-113901

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

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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://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (d)(1)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Number of non-vested options outstanding.

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

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

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Number of options vested.

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Weighted average grant-date fair value of options vested.

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