Employee Benefit Plan (Details Textuals) - USD ($) $ in Millions	12 Months Ended
Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
U.S. 401(k) Plan
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	$ 0.8	$ 0.8	$ 0.8
U.K. Defined Contribution Plan
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, contributions by employer, percentage	5.00%
Recognized deferred compensation expenses	$ 0.6	$ 0.7	$ 0.6

The amount of the cost recognized during the period for defined contribution plans.

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

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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.

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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.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

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