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GOODWILL AND INTANGIBLE ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2012
Jul. 31, 2011
Goodwill Allocated by Reportable Segment [Line Items]    
Goodwill $ 341,731 $ 290,606
Life Sciences [Member]
   
Goodwill Allocated by Reportable Segment [Line Items]    
Goodwill 179,490 [1] 131,852
Industrial [Member]
   
Goodwill Allocated by Reportable Segment [Line Items]    
Goodwill $ 162,241 $ 158,754
[1] (b) The amount for intangible assets as of April 30, 2012 excludes intangible assets, net, that is classified as held for sale of $567. See Note 16, Discontinued Operations, for further details.