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Supplementary Balance Sheet Information Composition of Property, Plant and Equipment under Capital Lease (Details) - Canyons [Member] - USD ($)
$ in Thousands
Jul. 31, 2017
Jul. 31, 2016
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 42,910 42,910
Capital Leased Assets, Machinery and Equipment 61,156 61,175
Capital Leased Assets, Gross 185,112 185,131
Capital Leased Assets, Accumulated Depreciation (37,000) (27,110)
Capital Leased Assets, Net $ 148,112 $ 158,021