GOODWILL AND INTANGIBLE ASSETS (Details 1) (USD $) In Thousands	Jul. 31, 2011	Jul. 31, 2010
Gross	$ 140,337	$ 135,851
Accumulated Amortization	78,602	67,024
Net	61,735	68,827
Patents and Unpatented Technology [Member]
Gross	102,372	99,825
Accumulated Amortization	64,921	57,210
Net	37,451	42,615
Customer-related intangibles [Member]
Gross	26,478	26,100
Accumulated Amortization	6,598	3,511
Net	19,880	22,589
Trademarks [Member]
Gross	6,802	6,438
Accumulated Amortization	4,684	4,196
Net	2,118	2,242
Other Finite Lived Intangible Assets [Member]
Gross	4,685	3,488
Accumulated Amortization	2,399	2,107
Net	$ 2,286	$ 1,381

Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph a(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

Name:	us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant