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, 2014
Stock Appreciation Rights (SARs) [Member]
Awards, outstanding beginning balance (in shares)	880
Awards, granted (in shares)	352
Awards, vested (in shares)	(421)
Awards, forfeited (in shares)	(28)
Awards, outstanding ending balance (in shares)	783
Weighted-average grant-date fair value, outstanding beginning balance (in dollars per share)	$ 16.06
Weighted-average grant-date fair value, granted (in dollars per share)	$ 23.60
Weighted-average grant-date fair value, vested (in dollars per share)	$ 15.30
Weighted-average grant-date fair value, forfeited (in dollars per share)	$ 17.00
Weighted-average grant-date fair value, outstanding ending balance (in dollars per share)	$ 19.42