ACQUISITION (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended				0 Months Ended
	Jul. 31, 2012		Jul. 31, 2011	Jul. 31, 2010	Mar. 01, 2012 Forte Bio [Member]
Business Acquisition [Line Items]
Percent of capital stock acquired					100.00%
Payments to acquire businesses, net of cash acquired	$ 167,638		$ 0	$ 8,984	$ 142,132
Estimated fair values of assets acquired and liabilities assumed
Purchase price					157,811
Cash acquired					15,679
Purchase price, net of cash acquired					142,132
Accounts receivable					2,477
Inventories					4,200
Other current assets					6,079
Property plant and equipment					1,277
Intangible assets					86,300
Non-current deferred tax assets					8,997
Other non-current assets					110
Total identifiable assets acquired, net of cash acquired					109,440
Deferred tax liabilities					31,681
Other non-current liabilities					3,371
Liabilities assumed					35,052
Goodwill (excess cost over value of net assets acquired)	$ 338,941	[1]	$ 290,606		$ 67,744

[1] For further discussion regarding environmental remediation liabilities refer to Note 14, Contingencies and Commitments.