Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Jan. 31, 2011	Jul. 31, 2011	Jul. 31, 2010
Dispositions of goodwill and other intangible assets		$ 3,600,000	$ 0
Gain on dispositions of goodwill and other intangible assets	400,000
Annual impairment		0	0
Net intangible assets		53,496,000	58,292,000
Customer Related Intangible Assets [Member]
Net intangible assets		33,500,000	37,800,000
Patents, Trademarks And Tradenames [Member]
Net intangible assets		$ 20,000,000	$ 20,500,000