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Supplementary Balance Sheet Information (Composition Of Property, Plant And Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2012
Jul. 31, 2011
Jan. 31, 2011
Supplementary Balance Sheet Information [Abstract]      
Land and land improvements $ 277,061 $ 271,742 $ 270,629
Buildings and building improvements 833,331 801,582 788,378
Machinery and equipment 559,897 539,983 541,512
Furniture and fixtures 237,585 215,862 210,626
Software 77,533 64,408 61,173
Vehicles 44,760 40,627 41,623
Construction in progress 16,618 34,638 29,574
Gross property, plant and equipment 2,046,785 1,968,842 1,943,515
Accumulated depreciation (988,855) (947,106) (899,017)
Property, plant and equipment, net $ 1,057,930 $ 1,021,736 $ 1,044,498