Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2012 defendant	Jul. 31, 2011
Commitments And Contingencies [Abstract]
Number of defendants	12
Total expense	$ 26.8	$ 24.3
2013	11.8
2014	7.7
2015	4.1
2016	1.7
2017	0.8
Thereafter	$ 0.4