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Stockholder's Equity (Details Textuals 2) - USD ($) | 12 Months Ended
--- | ---
Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015
Employee Stock Purchase Plan (ESPP) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock authorized to purchase | 10,000,000 |  |
Discount from market price | 15.00% |  |
Offering period |  | 6 months |
Maximum percentage of salary withheld for employee contribution | up to 10% |  |
Compensation contribution limit in percentage | may not exceed 15 |  |
Number of shares of common stock issued pursuant to the ESPP | 190,713 | 216,264 | 202,030
Common stock have been issued pursuant to the ESPP | 8,291,165 |  |
Shares were available for future grant under the Plan (in shares) | 1,788,909 |  |
Maximum annual contributions per employee, percent |  | 10.00% |
Share-based compensation arrangement by share-based payment award, maximum employee contribution permitted value | $ 25,000 |  |
Maximum annual contributions per employee, conditional percent |  | 15.00% |
2007 Equity Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock authorized to purchase | 16,000,000 |  |
Shares were available for future grant under the Plan (in shares) | 10,103,589 |  |

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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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