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Supplementary Balance Sheet Information (Composition Of Property, Plant And Equipment) (Details) - USD ($)
$ in Thousands
Apr. 30, 2017
Jul. 31, 2016
Apr. 30, 2016
Property, Plant and Equipment [Line Items]      
Land and land improvements $ 531,058 $ 440,300 $ 439,815
Buildings and building improvements 1,170,700 1,025,515 1,028,408
Machinery and equipment 967,157 866,008 878,730
Furniture and fixtures 275,235 284,959 305,159
Software 105,352 103,754 112,551
Vehicles 61,415 58,159 62,166
Construction in progress 34,029 39,396 28,019
Gross property, plant and equipment 3,144,946 2,818,091 2,854,848
Accumulated depreciation (1,497,942) (1,454,277) (1,484,474)
Property, plant and equipment, net $ 1,647,004 $ 1,363,814 $ 1,370,374