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Summary of Significant Accounting Policies (Details Textuals 2) (USD $) | 12 Months Ended
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Jul. 31, 2013 | Jul. 31, 2012 | Jul. 31, 2011
Retained Insurance Liabilities [Abstract] |  |  |
Amount deductible per claim - insurance policies | $ 250,000 |  |
Amount deductible per claim - medical policy | 225,000 |  |
Self insured claims reserve | 6,100,000 | 5,700,000 |
Share-based Arrangements with Employees and Nonemployees [Abstract] |  |  |
Proceeds from the exercise of stock options | 21,442,000 | 13,651,000 | 7,082,000
Income tax benefit realized from stock-based payment compensation | 6,097,000 | 4,367,000 | 3,547,000
Impairment of long-lived assets |  | $ 8,771,000 |
Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, estimated useful lives | between 5 and 10 years |  |
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 |  |

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- Definition Amount deductible per claim - Insurance Policies. + References No definition available. + Details
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- Definition Amount deductible per claim - Medical Policy. + References No definition available. + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + 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=32706628&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 Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: 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 Reference 3: 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=31042434&loc=d3e3255-108585 + Details
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