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Supplementary Balance Sheet Information (Composition Of Property, Plant And Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2012
Jul. 31, 2012
Oct. 31, 2011
Balance Sheet Related Disclosures [Abstract]      
Land and land improvements $ 282,161 $ 281,729 $ 271,777
Buildings and building improvements 838,745 838,780 802,431
Machinery and equipment 566,368 563,309 540,492
Furniture and fixtures 245,295 243,587 216,608
Software 85,122 81,659 66,577
Vehicles 46,972 44,798 41,111
Construction in progress 62,907 36,979 83,808
Gross property, plant and equipment 2,127,570 2,090,841 2,022,804
Accumulated depreciation (1,070,927) (1,041,634) (972,778)
Property, plant and equipment, net $ 1,056,643 $ 1,049,207 $ 1,050,026