Summary of Significant Accounting Policies (Details) $ in Thousands		12 Months Ended
		Jul. 31, 2016 USD ($) Founder	Jul. 31, 2015 USD ($)	Jul. 31, 2014 USD ($)
Defined Contribution Plan Disclosure [Line Items]
Number of founders | Founder		1
Employee contribution, percentage		4.00%
Minimum percentage right of Class B common stock holders to elect Board of Directors		75.00%
Foreign currency transaction gains (losses) | $		$ 44	$ 134	$ (25)
Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Employee contribution, percentage		4.00%
Time and Materials [Member] | Consulting [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue recognition policy		As incurred at contract rates.
Fixed Price [Member] | Consulting [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue recognition policy		Percentage of completion, approximating the ratio of either total costs or Level of Effort (LOE) hours incurred to date to total estimated costs or LOE hours.
Cost-Plus [Member] | Consulting [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue recognition policy		Costs as incurred plus fees. Fees are recognized as revenue using percentage of completion determined by the percentage of LOE hours incurred to total LOE hours in the respective contracts.
Buildings [Member]
Property, Plant and Equipment [Line Items]
Depreciation/ amortization method		Straight-line
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives		32 years
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives		40 years
Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciation/ amortization method		Straight-line
Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives		7 years
Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives		15 years
Field Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation/ amortization method		Straight-line
Field Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives		3 years
Field Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives		7 years
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation/ amortization method		Straight-line and Accelerated
Computer Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives		3 years
Computer Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives		7 years
Computer Software [Member]
Property, Plant and Equipment [Line Items]
Depreciation/ amortization method		Straight-line
Useful lives		10 years
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation/ amortization method		Straight-line
Office Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives		3 years
Office Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives		7 years
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Depreciation/ amortization method		Straight-line
Vehicles [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives		3 years
Vehicles [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives		5 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciation/ amortization method		Straight-line
Useful lives	[1]

[1] Leasehold improvements are amortized for book purposes over the terms of the leases or the estimated useful lives of the assets, whichever is shorter.