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Common Stock Repurchases (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Sep. 22, 2011
Stock Repurchase [Abstract]
Additional common stock authorized for repurchase (in shares)			40,000,000
Common stock authorized for repurchase (in shares)			98,000,000
Repurchased common stock (in shares)		500,000
Stock repurchase price per share (in dollars per share)		$ 27.77
Value of repurchased common stock		$ 13.9
Number of shares repurchased under the program	50,286,782
Number of shares available for repurchase under Stock Repurchase Program	47,713,218
Dilutive earnings per share, Impact of repurchase shares on the weighted average common shares outstanding (in dollars per share)	$ 0.01
Remittance to taxing authorities under statutory withholding	$ 0.1	$ 0.6

X

- Definition

The total number of shares repurchased under the program as if the balance sheet date.

+ References

No definition available.

+ Details

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X

- Definition

The dilutive earnings per share impact of all repurchased shares on the weighted average number of common shares outstanding during the period.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Represents the price per share paid to acquire company's common stock under stock repurchase program.

+ References

No definition available.

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X

- Definition

The number additional shares approved under company's stock repurchase program by the entity's board of directors.

+ References

No definition available.

+ Details

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- Definition

The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

No definition available.

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

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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

No definition available.

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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

No definition available.

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