OTHER CURRENT AND NON-CURRENT ASSETS (Details 2) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jul. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Cost/ Amortized Cost Basis	$ 68,623	$ 71,392
Fair Value	70,744	75,821
Gross Unrealized Holding Gains	2,937	4,471
Gross Unrealized Holding Losses	(816)	(42)
Net Unrealized Holding Gains	2,121	4,429
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost/Amortized Cost Basis	31,546	30,548
Debt Securities, Fair Value	32,393	32,378
Debt Securities, Gross Unrealized Holding Gains	1,274	1,838
Debt Securities, Gross Unrealized Holdings Losses	(427)	(8)
Debt Securities, Net Unrealized Holding Gains	847	1,830
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost/Amortized Cost Basis	11,339	8,049
Debt Securities, Fair Value	11,543	8,610
Debt Securities, Gross Unrealized Holding Gains	294	562
Debt Securities, Gross Unrealized Holdings Losses	(90)	(1)
Debt Securities, Net Unrealized Holding Gains	204	561
Federal Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost/Amortized Cost Basis	19,810	25,454
Debt Securities, Fair Value	20,642	27,231
Debt Securities, Gross Unrealized Holding Gains	1,131	1,777
Debt Securities, Gross Unrealized Holdings Losses	(299)	0
Debt Securities, Net Unrealized Holding Gains	832	1,777
Mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost/Amortized Cost Basis	5,752	6,129
Debt Securities, Fair Value	5,990	6,392
Debt Securities, Gross Unrealized Holding Gains	238	290
Debt Securities, Gross Unrealized Holdings Losses	0	(27)
Debt Securities, Net Unrealized Holding Gains	238	263
Municipal government [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost/Amortized Cost Basis		1,000
Debt Securities, Fair Value		1,004
Debt Securities, Gross Unrealized Holding Gains		4
Debt Securities, Gross Unrealized Holdings Losses		0
Debt Securities, Net Unrealized Holding Gains		4
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Equity Securities, Cost/Amortized Cost Basis	176	212
Equity Securities, Fair Value	176	206
Equity Securities, Gross Unrealized Holding Gains	0	0
Equity Securities, Gross Unrealized Holdings Losses	0	(6)
Equity Securities, Net Unrealized Holding Gains	$ 0	$ (6)