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Stockholder's Equity (Details 2) (Stock Options, USD $)	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Stock Options
Number Of Shares [Roll Forward]
Non-vested shares at July 31, 2011	8,328,000
Grants of options	880,000
Vested	(3,156,000)
Forfeitures or expirations (in shares)	(39,000)
Non-vested shares at July 31, 2012	6,013,000	8,328,000
Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested shares at July 31, 2011	6.66
Grants of options	$ 6.01	$ 6.59	$ 6.60
Vested	$ 6.63
Forfeitures or expirations	$ 5.33
Non-vested shares at July 31, 2012	6.59	6.66

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- Definition

Represents the number of stock options vested during the reporting period.

+ References

No definition available.

+ Details

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- Definition

Represents weighted average grant date fair value of options forfeited and expired.

+ References

No definition available.

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- Definition

The number of non-vested equity-based payment options, that validly exist and are outstanding as of the balance sheet date.

+ References

No definition available.

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- Definition

Represents the weighted average grant date fair value of nonvested options.

+ References

No definition available.

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- Definition

Represents the weighted average grant date fair value of options vested.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: 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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