GOODWILL AND INTANGIBLE ASSETS (Details 1) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jul. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross	$ 238,439	$ 238,122
Accumulated Amortization	101,196	86,978
Net	137,243	151,144
Patents and unpatented technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	123,707	125,938
Accumulated Amortization	69,992	65,262
Net	53,715	60,676
Customer-related intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	97,016	93,901
Accumulated Amortization	22,425	13,323
Net	74,591	80,578
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	13,291	13,104
Accumulated Amortization	6,166	5,269
Net	7,125	7,835
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	4,425	5,179
Accumulated Amortization	2,613	3,124
Net	$ 1,812	$ 2,055