Supplementary Balance Sheet Information Composition of Property, Plant and Equipment under Capital Lease (Details) - Canyons [Member] - USD ($) $ in Thousands	Jul. 31, 2016	Jul. 31, 2015
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	61,175	61,175
Capital Leased Assets, Gross	185,131	185,131
Capital Leased Assets, Accumulated Depreciation	(27,110)	(17,212)
Capital Leased Assets, Net	$ 158,021	$ 167,919