Commitments and Contingencies (Details) (Change in Control Agreement [Member])	12 Months Ended
	Jul. 31, 2012
Change in Control Agreement [Member]
Loss Contingencies [Line Items]
Time frame for agreement to expire after the change of control	1 year
Time frame to enter into a separation agreement after termination	30 days
Number of years of base salary to be paid per agreement	1 year
Number of monthly equal installments to be paid after termination (in months)	12
Time frame for all awards to be exercised after termination	1 year