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Employee Benefit Plan (Details Textuals) - USD ($) $ in Millions | 12 Months Ended
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Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan, contributions by employer, percentage | 20.00% |  |
Maximum employer contribution on employees salary deferral | 15.00% |  |
Recognized deferred compensation expenses | $ 0.9 | $ 0.8 | $ 0.8
Foreign Plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan, contributions by employer, percentage | 5.00% |  |
Recognized deferred compensation expenses | $ 0.6 | $ 0.6 | $ 0.7

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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