Stock Compensation Plan (Schedule of Share Based Compensation SARs Activity) (Details) (Stock Appreciation Rights (SARs) [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jul. 31, 2013
Stock Appreciation Rights (SARs) [Member]
Awards, outstanding beginning balance (in shares)	976
Awards, granted (in shares)	412
Awards, vested (in shares)	(414)
Awards, forfeited (in shares)	(94)
Awards, outstanding ending balance (in shares)	880
Weighted-average grant-date fair value, outstanding beginning balance (in dollars per share)	$ 13.43
Weighted-average grant-date fair value, granted (in dollars per share)	$ 18.38
Weighted-average grant-date fair value, vested (in dollars per share)	$ 13.52
Weighted-average grant-date fair value, forfeited (in dollars per share)	$ 15.01
Weighted-average grant-date fair value, outstanding ending balance (in dollars per share)	$ 16.06