Summary of Significant Accounting Policies (Tables)

12 Months Ended

Jul. 31, 2019

Summary of Significant Accounting Policies [Abstract]

Methods of Depreciation or Amortization and Useful Lives for All Other Long-Lived Assets

Methods of depreciation or amortization and useful lives for all other long-lived assets are summarized in the following table.

	Depreciation / Amortization Method	Useful Lives
Buildings	Straight-line	32-40 Years
Building Improvements	Straight-line	7-15 Years
Field Equipment	Straight-line	3-7 Years
Computer equipment	Straight-line	3-7 Years
Computer software	Straight-line	3-10 Years
Office furniture and equipment	Straight-line	3-7 Years
Vehicles	Straight-line	3-5 Years
Leasehold improvements	Straight-line	(a)

(a) Leasehold improvements are amortized for book purposes over the terms of the leases or the estimated useful lives of the assets, whichever is shorter.