GOODWILL AND INTANGIBLE ASSETS (Details 1) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012	Jul. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross	$ 240,113	$ 238,122
Accumulated Amortization	92,774	86,978
Net	147,339	151,144
Patents and unpatented technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	127,662	125,938
Accumulated Amortization	68,530	65,262
Net	59,132	60,676
Customer-related intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	94,803	93,901
Accumulated Amortization	16,222	13,323
Net	78,581	80,578
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	13,201	13,104
Accumulated Amortization	5,555	5,269
Net	7,646	7,835
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	4,447	5,179
Accumulated Amortization	2,467	3,124
Net	$ 1,980	$ 2,055