Summary of Significant Accounting Policies (Summary On Estimated Useful Life Of Property, Plant And Equipment) (Details)	12 Months Ended
	Jul. 31, 2018
Software and Software Development Costs [Member]
Estimated life in years	3 years
Minimum [Member] | Land Improvements [Member]
Estimated life in years	10 years
Minimum [Member] | Buildings and Building Improvements [Member]
Estimated life in years	7 years
Minimum [Member] | Machinery and Equipment [Member]
Estimated life in years	2 years
Minimum [Member] | Furniture and Fixtures [Member]
Estimated life in years	3 years
Minimum [Member] | Vehicles [Member]
Estimated life in years	3 years
Maximum [Member] | Land Improvements [Member]
Estimated life in years	35 years
Maximum [Member] | Buildings and Building Improvements [Member]
Estimated life in years	30 years
Maximum [Member] | Machinery and Equipment [Member]
Estimated life in years	30 years
Maximum [Member] | Furniture and Fixtures [Member]
Estimated life in years	10 years
Maximum [Member] | Vehicles [Member]
Estimated life in years	10 years