GOODWILL AND INTANGIBLE ASSETS (Details 1) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Jul. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross	$ 241,058	$ 238,122
Accumulated Amortization	99,900	86,978
Net	141,158	151,144
Patents and unpatented technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	126,219	125,938
Accumulated Amortization	70,712	65,262
Net	55,507	60,676
Customer-related intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	97,107	93,901
Accumulated Amortization	20,614	13,323
Net	76,493	80,578
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	13,275	13,104
Accumulated Amortization	5,982	5,269
Net	7,293	7,835
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	4,457	5,179
Accumulated Amortization	2,592	3,124
Net	$ 1,865	$ 2,055