Supplementary Balance Sheet Information (Composition Of Property, Plant And Equipment) (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Jul. 31, 2017	Oct. 31, 2016
Property, Plant and Equipment [Line Items]
Land and land improvements	$ 550,627	$ 553,655	$ 530,634
Buildings and building improvements	1,186,731	1,210,864	1,157,546
Machinery and equipment	985,639	987,080	954,722
Furniture and fixtures	284,815	280,292	291,141
Software	111,440	108,048	106,901
Vehicles	59,600	59,596	64,344
Construction in progress	77,512	49,359	82,895
Gross property, plant and equipment	3,256,364	3,248,894	3,188,183
Accumulated depreciation	(1,561,672)	(1,534,740)	(1,489,096)
Property, plant and equipment, net	$ 1,694,692	$ 1,714,154	$ 1,699,087