Retirement And Profit Sharing Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Retirement And Profit Sharing Plans
Employee contribution percentage	100.00%
Employer contribution matching equal to 50%	6.00%
Employment period (in months)	12
Service period (in hours)	1,000
Total service period (in hours)	1,500
Retirement plan expense	$ 1.5	$ 0.4	$ 1.3

Defined Contribution Plan, Maximum Employee Contribution Percentage

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- Definition

Defined Contribution Plan, Maximum Employer Contribution Percentage

+ 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.

+ 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.

+ Details

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Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

- Definition

Requisite Employment Period in Hours to be eligible for the Company's matching contributions.

+ 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 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 2: 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

+ Details

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