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Supplementary Balance Sheet Information (Narrative) (Details) (USD $) In Millions | 12 Months Ended
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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 |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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