Supplementary Balance Sheet Information (Composition Of Property, Plant And Equipment) (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Jul. 31, 2016	Jan. 31, 2016
Property, Plant and Equipment [Line Items]
Land and land improvements	$ 535,577	$ 440,300	$ 438,373
Buildings and building improvements	1,180,941	1,025,515	1,024,065
Machinery and equipment	997,225	866,008	873,045
Furniture and fixtures	302,446	284,959	302,077
Software	114,750	103,754	111,118
Vehicles	69,723	58,159	62,093
Construction in progress	23,704	39,396	24,767
Gross property, plant and equipment	3,224,366	2,818,091	2,835,538
Accumulated depreciation	(1,529,620)	(1,454,277)	(1,443,649)
Property, plant and equipment, net	$ 1,694,746	$ 1,363,814	$ 1,391,889