INCOME TAXES (Details 5) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating losses	$ 100,428
Tax Credits	36,259
Finite Lived [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating losses	25,619
Tax Credits	35,442
2013 [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating losses	0
Tax Credits	337
2014-2022 [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating losses	4,311
Tax Credits	29,894
2023-2032 [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating losses	21,308
Tax Credits	5,211
Indefinite [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Operating losses	74,809
Tax Credits	$ 817