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Supplementary Balance Sheet Information (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Balance Sheet Related Disclosures [Abstract]      
Depreciation expense $ 144,000 $ 136,600 $ 130,200
Amortization expense for intangible assets 5,100 $ 4,000 $ 2,500
Estimated amortization expense for intangible assets, year one 3,117    
Estimated amortization expense for intangible assets, year two 2,566    
Estimated amortization expense for intangible assets, year three 2,566    
Estimated amortization expense for intangible assets, year four 2,566    
Estimated amortization expense for intangible assets, year five $ 2,566