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Stock Repurchase Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended	74 Months Ended
	Apr. 30, 2012	Apr. 30, 2012	Jul. 16, 2008	Mar. 09, 2006
Stock Repurchase Plan [Abstract]
Number of shares authorized to repurchase				3,000,000
Additional number of shares authorized to repurchase			3,000,000
Number of repurchased common shares	203,377	4,468,181
Value of repurchased common stock	$ 7.9	$ 170.7
Remaining shares available for repurchase under existing program	1,531,819	1,531,819

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- Definition

Stock Repurchase Program, Additional Number of Shares Authorized to be Repurchased

+ References

No definition available.

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

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-Number 12

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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-Publisher SEC

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-Number 210

-Section 04

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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