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Supplementary Balance Sheet Information (Composition Of Property, Plant And Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2013
Jul. 31, 2012
Jan. 31, 2012
Balance Sheet Related Disclosures [Abstract]      
Land and land improvements $ 289,127 $ 281,729 $ 277,061
Buildings and building improvements 854,130 838,780 833,331
Machinery and equipment 598,944 563,309 559,897
Furniture and fixtures 257,496 243,587 237,585
Software 92,473 81,659 77,533
Vehicles 48,307 44,798 44,760
Construction in progress 15,423 36,979 16,618
Gross property, plant and equipment 2,155,900 2,090,841 2,046,785
Accumulated depreciation (1,098,501) (1,041,634) (988,855)
Property, plant and equipment, net $ 1,057,399 $ 1,049,207 $ 1,057,930