Supplementary Balance Sheet Information Composition of Property, Plant and Equipment under Capital Lease (Details) - Canyons [Member] - USD ($) $ in Thousands	Jul. 31, 2019	Jul. 31, 2018
Property, Plant and Equipment [Line Items]
Capital Leased Assets, Land	$ 31,818	$ 31,818
Capital Leased Assets, Land Improvements	49,228	49,228
Capital Leased Assets, Buildings and Building Improvements	42,160	42,660
Capital Leased Assets, Machinery and Equipment	60,384	60,384
Capital Leased Assets, Gross	183,590	184,090
Capital Leased Assets, Accumulated Depreciation	(56,040)	(46,502)
Capital Leased Assets, Net	$ 127,550	$ 137,588