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Common Stock Repurchases (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Oct. 31, 2013		Jan. 31, 2013		Apr. 30, 2014
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]
Options Exercised	14,000		73,228		(335)
Exercise Price	$ 16.43		$ 8.89		$ 17.59
Shares Net Settled for Exercise	7,241		18,127
Shares Withheld for Taxes	2,519	[1]	17,461	[1]
Net Shares to Employee	4,240		37,640
Share Price for Withholding	$ 31.77		$ 35.91
Tax Withholding	$ 80		$ 627
[1] Shares withheld for taxes are treated as a repurchase of shares for accounting purposes but do not count against the Company's stock repurchase program.

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Represents the number of net impact on number of shares settled resulting from exercise.

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Represents the share price of entity's common stock withheld by the entity for withholding taxes.

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Represents the number of shares withheld for taxes.

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Represents the aggregate amount of entity's tax withholding to the IRS.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Number of share options (or share units) exercised during the current period.

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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



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-SubTopic 10

-Section S99

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-Section S99

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-SubTopic 10

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



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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