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Description of Business and Summary of Significant Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jan. 31, 2015 Segment	Jul. 31, 2014
Description Of Business and Summary Of Significant Accounting Policies [Line Items]
Tax benefits realized upon ultimate settlement, Description	The second step is to measure the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement.
Number of operating segments	2us-gaap_NumberOfOperatingSegments
Number of reportable segment	1us-gaap_NumberOfReportableSegments
Capitalized software costs	$ 60.4us-gaap_CapitalizedComputerSoftwareNet	$ 61.7us-gaap_CapitalizedComputerSoftwareNet
Accumulated amortization expense	$ 39.9us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization	$ 38.6us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization
Interest Rate Swap
Description Of Business and Summary Of Significant Accounting Policies [Line Items]
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For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

-SubTopic 20

-Section 50

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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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Number of interest rate derivative instruments held by the entity at the reporting date.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Description of material events or transactions not otherwise specified in the taxonomy pertaining to income taxes that would be relevant to the user of the financial statements.

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-Name Accounting Standards Codification

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