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Supplementary Balance Sheet Information (Narrative) (Details) (USD $)
In Millions
 12 Months Ended
Jul. 31, 2011
Jul. 31, 2010
Jul. 31, 2009
Supplementary Balance Sheet Information      
Depreciation expense $ 116.3 $ 109.8 $ 106.6
Amortization expense for intangible assets 1.7 0.8 0.6
Estimated amortization expense for intangible assets, year one 1.2    
Estimated amortization expense for intangible assets, year two 1.2    
Estimated amortization expense for intangible assets, year three 1.2    
Estimated amortization expense for intangible assets, year four 1.2    
Estimated amortization expense for intangible assets, year five $ 1.2