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Retirement and Profit Sharing Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Jul. 31, 2012 hour | Jul. 31, 2011 | Jul. 31, 2010
Compensation and Retirement Disclosure [Abstract] |  |  |
Employee contribution percentage | 100.00% |  |
Company match amount equal to participant's contribution | 50.00% |  |
Employer contribution matching equal to 50% | 6.00% |  |
Employment period (in months) | 12 months |  |
Service period (in hours) | 1,000 |  |
Total service period (in hours) | 1,500 |  |
Retirement plan expense | $ 2.4 | $ 1.5 | $ 0.4

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- Definition Defined Contribution Plan, Maximum Employee Contribution Percentage + References No definition available. + Details
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- Definition Defined Contribution Plan, Maximum Employer Contribution Percentage + References No definition available. + Details
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- Definition Requisite Employment Period in Months to be eligible for the Company's matching contributions if 1,000 service hours are worked. + References No definition available. + Details
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- Definition Requisite Employment Period in Hours within a consecutive 12 month period to be eligible for the Company's matching contributions. + References No definition available. + Details
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- Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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