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Stockholder's Equity (Details 2) (Stock Options, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Stock Options
Number Of Shares [Roll Forward]
Non-vested shares at July 31, 2012	6,013
Grants of non-vested shares	335
Vested	(2,889)
Forfeitures or expirations (in shares)	(63)
Non-vested shares at July 31, 2013	3,396	6,013
Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested shares at July 31, 2012	$ 6.59
Grants of non-vested shares	$ 7.87	$ 6.01	$ 6.59
Vested	$ 6.57
Forfeitures or expirations	$ 6.06
Non-vested shares at July 31, 2013	$ 6.55	$ 6.59

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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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://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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X

- Definition

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

+ References

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X

- 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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- Definition

Number of non-vested options outstanding.

+ References

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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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