OTHER CURRENT AND NON-CURRENT ASSETS (Details 3) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Jul. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities continuous unrealized loss position less than twelve months fair value	$ 616	$ 3,487
Available for sale securities continuous unrealized loss position less than 12 months aggregate losses	7	63
Available for sale securities continuous unrealized loss position twelve months or longer fair value	1,966	0
Available for sale securities continuous unrealized loss position 12 months or longer aggregate losses	35	0
Available for sale securities continuous unrealized loss position fair value	2,582	3,487
Available for sale securities continuous unrealized loss position aggregate losses	42	63
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities continuous unrealized loss position less than twelve months fair value	0	1,985
Available for sale securities continuous unrealized loss position less than 12 months aggregate losses	0	33
Available for sale securities continuous unrealized loss position twelve months or longer fair value	462	0
Available for sale securities continuous unrealized loss position 12 months or longer aggregate losses	8	0
Available for sale securities continuous unrealized loss position fair value	462	1,985
Available for sale securities continuous unrealized loss position aggregate losses	8	33
Mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities continuous unrealized loss position less than twelve months fair value	0	1,502
Available for sale securities continuous unrealized loss position less than 12 months aggregate losses	0	30
Available for sale securities continuous unrealized loss position twelve months or longer fair value	1,504	0
Available for sale securities continuous unrealized loss position 12 months or longer aggregate losses	27	0
Available for sale securities continuous unrealized loss position fair value	1,504	1,502
Available for sale securities continuous unrealized loss position aggregate losses	27	30
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities continuous unrealized loss position less than twelve months fair value	589
Available for sale securities continuous unrealized loss position less than 12 months aggregate losses	1
Available for sale securities continuous unrealized loss position twelve months or longer fair value	0
Available for sale securities continuous unrealized loss position 12 months or longer aggregate losses	0
Available for sale securities continuous unrealized loss position fair value	589
Available for sale securities continuous unrealized loss position aggregate losses	1
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities continuous unrealized loss position less than twelve months fair value	27
Available for sale securities continuous unrealized loss position less than 12 months aggregate losses	6
Available for sale securities continuous unrealized loss position twelve months or longer fair value	0
Available for sale securities continuous unrealized loss position 12 months or longer aggregate losses	0
Available for sale securities continuous unrealized loss position fair value	27
Available for sale securities continuous unrealized loss position aggregate losses	$ 6