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Description of Business and Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2016 USD ($) Derivative | Jan. 31, 2015 USD ($) | Jan. 31, 2016 USD ($) Derivative Segment | Jan. 31, 2015 USD ($) | Jul. 31, 2015 USD ($)
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. |  |
Marketable securities, amortized cost basis |  | $ 21,100 |  | $ 21,100 |  |
Marketable equity securities |  | 17,465 |  | 17,465 |  | $ 0
Unrealized loss on available-for-sale securities, net (c) | [1] | (4,146) | $ 0 | (3,651) | $ 0 |
Capitalized software costs |  | 70,500 |  | 70,500 |  | 65,100
Accumulated amortization expense |  | $ 45,600 |  | $ 45,600 |  | $ 42,600
Number of operating segments | Segment |  |  |  | 2 |  |
Number of reportable segment | Segment |  |  |  | 1 |  |
Interest Rate Swap |  |  |  |  |  |
Description Of Business and Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of interest rate derivatives held | Derivative |  | 2 |  | 2 |  |
[1] | Net of tax effect of $(282) for the three months ended January 31, 2016. Net of tax effect of $(3) for the six months ended January 31, 2016.

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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