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Summary of Significant Accounting Policies (Details Textuals 1) (USD $) | 12 Months Ended
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Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2010
Retained Insurance Liabilities [Abstract] |  |  |
Amount deductible per claim - insurance policies | $ 250,000 |  |
Amount deductible per claim - medical policy | 225,000 |  |
Self insured claims reserve | 5,700,000 | 5,500,000 |
Share-based Arrangements with Employees and Nonemployees [Abstract] |  |  |
Proceeds from the exercise of stock options | 13,651,000 | 7,082,000 | 6,285,000
Excess tax benefit from stock-based payment compensation | $ 4,367,000 | $ 3,547,000 | $ 5,643,000
Internally developed or purchased software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, estimated useful lives | 3 to 5 years |  |
Transportation and other equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, estimated useful lives | 3 to 7 years |  |
Office furniture and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, estimated useful lives | 3 to 10 years |  |
Buildings and leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, estimated useful lives | 15 to 40 years or the lease term, whichever is shorter |  |
Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, estimated useful lives | between 5 and 10 years |  |

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- Definition Amount of excess tax benefit (tax deficiency) that arises when compensation cost from non-qualified share-based compensation recognized on the entity's tax return exceeds (is less than) compensation cost from equity-based compensation recognized in financial statements. Excess tax benefit (tax deficiency) increases (decreases) net cash provided by financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6576910&loc=d3e11374-113907 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -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 FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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