Restructuring (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			12 Months Ended
	Jul. 31, 2010 employee	Jul. 31, 2009 employee	Apr. 30, 2012 employee	Jul. 31, 2011 Industrial Products Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs in response to the downturn in the worldwide economy				$ 0.7
Number of employees terminated	550	2,800	5
Asset impairment costs	2.1
Employee severance costs		17.3
Distribution center consolidation and production line transfers	$ 0.5