Summary of Significant Accounting Policies (Details)	12 Months Ended
	Jul. 31, 2019 Founder
Defined Contribution Plans [Abstract]
Number of founders	2
Buildings [Member]
Depreciation/ amortization method and useful lives [Abstract]
Depreciation/ amortization method	Straight-line
Buildings [Member] | Minimum [Member]
Depreciation/ amortization method and useful lives [Abstract]
Useful lives	32 years
Buildings [Member] | Maximum [Member]
Depreciation/ amortization method and useful lives [Abstract]
Useful lives	40 years
Building Improvements [Member]
Depreciation/ amortization method and useful lives [Abstract]
Depreciation/ amortization method	Straight-line
Building Improvements [Member] | Minimum [Member]
Depreciation/ amortization method and useful lives [Abstract]
Useful lives	7 years
Building Improvements [Member] | Maximum [Member]
Depreciation/ amortization method and useful lives [Abstract]
Useful lives	15 years
Field Equipment [Member]
Depreciation/ amortization method and useful lives [Abstract]
Depreciation/ amortization method	Straight-line
Field Equipment [Member] | Minimum [Member]
Depreciation/ amortization method and useful lives [Abstract]
Useful lives	3 years
Field Equipment [Member] | Maximum [Member]
Depreciation/ amortization method and useful lives [Abstract]
Useful lives	7 years
Computer Equipment [Member]
Depreciation/ amortization method and useful lives [Abstract]
Depreciation/ amortization method	Straight-line
Computer Equipment [Member] | Minimum [Member]
Depreciation/ amortization method and useful lives [Abstract]
Useful lives	3 years
Computer Equipment [Member] | Maximum [Member]
Depreciation/ amortization method and useful lives [Abstract]
Useful lives	7 years
Computer Software [Member]
Depreciation/ amortization method and useful lives [Abstract]
Depreciation/ amortization method	Straight-line
Computer Software [Member] | Minimum [Member]
Depreciation/ amortization method and useful lives [Abstract]
Useful lives	3 years
Computer Software [Member] | Maximum [Member]
Depreciation/ amortization method and useful lives [Abstract]
Useful lives	10 years
Office Furniture and Equipment [Member]
Depreciation/ amortization method and useful lives [Abstract]
Depreciation/ amortization method	Straight-line
Office Furniture and Equipment [Member] | Minimum [Member]
Depreciation/ amortization method and useful lives [Abstract]
Useful lives	3 years
Office Furniture and Equipment [Member] | Maximum [Member]
Depreciation/ amortization method and useful lives [Abstract]
Useful lives	7 years
Vehicles [Member]
Depreciation/ amortization method and useful lives [Abstract]
Depreciation/ amortization method	Straight-line
Vehicles [Member] | Minimum [Member]
Depreciation/ amortization method and useful lives [Abstract]
Useful lives	3 years
Vehicles [Member] | Maximum [Member]
Depreciation/ amortization method and useful lives [Abstract]
Useful lives	5 years
Leasehold Improvements [Member]
Depreciation/ amortization method and useful lives [Abstract]
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.