Summary of Significant Accounting Policies (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Concentration Risk [Line Items]
Advertising expenses	$ 8.8	$ 12.7	$ 2.6
Number of customer accounted, not exceeds ten percent of revenues (in numbers)	0	0	0
Number of customer accounted, not exceeds ten percent of Company's accounts receivables (in numbers)	0	0
Accounts Receivable
Concentration Risk [Line Items]
State Farm Insurance, Percentage (in percent)			11.00%