Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)	12 Months Ended		12 Months Ended		12 Months Ended
	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2012 Customer Related Intangible Assets [Member]	Jul. 31, 2011 Customer Related Intangible Assets [Member]	Jul. 31, 2012 Patents, Trademarks And Tradenames [Member]	Jul. 31, 2011 Patents, Trademarks And Tradenames [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Dispositions of goodwill and other intangible assets	$ 3,600,000
Gain on dispositions of goodwill and other intangible assets	400,000
Net intangible assets	$ 53,496,000	$ 46,200,000	$ 30,100,000	$ 33,500,000	$ 16,100,000	$ 20,000,000
Weighted average life			12 years 8 months 1 day		9 years 9 months 4 days