Stock-Based Compensation Stock-Based Awards Granted in Subsequent Period (Details) (Subsequent Event [Member], USD $)	12 Months Ended
	Jul. 31, 2013
Subsequent Event [Line Items]
Total unrecognized stock-based compensation, net of estimated forfeitures and assuming achievement of the pre-established performance goal at a target level, related to stock-based awards authorized for issuance.	$ 2,728,000
Stock Options [Member]
Subsequent Event [Line Items]
Date that the Board of Directors authorized the stock-based awards for issuance	Aug. 01, 2013
Number of stock-based awards authorized for issuance	245,000
Vesting period (in years)	5 years
Contractual term (in years)	10 years
Performance Shares [Member]
Subsequent Event [Line Items]
Date that the Board of Directors authorized the stock-based awards for issuance	Oct. 02, 2013
Number of stock-based awards authorized for issuance	62,834
Performance period (in years)	3 years