ACCOUNTING POLICIES AND RELATED MATTERS (Details Textuals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Net transaction gain (loss) on Settlement of foreign denominated receivable (Payables)	$ 2,087	$ (816)	$ 191
Minimum percentage for equity method of accounting	20.00%
Amortization Period of Intangible Assets	20
Amortization method of Finite lived Intangible assets	The Company's amortizable intangible assets, which are comprised almost entirely of patented and unpatented technology, customer-related intangibles and trademarks, are subject to amortization for periods ranging up to 20years, principally on a straight-line basis.
Employee stock options and restricted stock units which were not included in the computation of diluted shares	467	1,234	2,933
Leasehold Improvements Depreciation Description	Leasehold improvements are depreciated over the shorter of the remaining life or the remaining lease term.
Building [Member]
Estimated Minimum useful lives for assets	30
Estimated Maximum useful lives for assets	50
Machinery and Equipment [Member]
Estimated Minimum useful lives for assets	3
Estimated Maximum useful lives for assets	10
Information Technology Hardware and Software [Member]
Estimated Minimum useful lives for assets	3
Estimated Maximum useful lives for assets	10
Furniture and Fixtures [Member]
Estimated Minimum useful lives for assets	8
Estimated Maximum useful lives for assets	10