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, 2012
Stock Appreciation Rights (SARs) [Member]
Awards, outstanding beginning balance (in shares)	1,300
Awards, granted (in shares)	651
Awards, vested (in shares)	(930)
Awards, forfeited (in shares)	(45)
Awards, outstanding ending balance (in shares)	976
Weighted-average grant-date fair value, outstanding beginning balance (in dollars per share)	$ 11.17
Weighted-average grant-date fair value, granted (in dollars per share)	$ 12.71
Weighted-average grant-date fair value, vested (in dollars per share)	$ 10.12
Weighted-average grant-date fair value, forfeited (in dollars per share)	$ 13.82
Weighted-average grant-date fair value, outstanding ending balance (in dollars per share)	$ 13.43