OTHER CURRENT AND NON-CURRENT ASSETS (Details 2) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Jul. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost/Amortized Cost Basis	$ 71,392	$ 77,448
Fair Value	75,821	91,056
Gross Unrealized Holding Gains	4,471	13,671
Gross Unrealized Holding Losses	(42)	(63)
Net Unrealized Holding Gains	4,429	13,608
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost/Amortized Cost Basis	30,548	30,239
Fair Value	32,378	32,020
Gross Unrealized Holding Gains	1,838	1,814
Gross Unrealized Holding Losses	(8)	(33)
Net Unrealized Holding Gains	1,830	1,781
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost/Amortized Cost Basis	8,049	9,544
Fair Value	8,610	10,210
Gross Unrealized Holding Gains	562	666
Gross Unrealized Holding Losses	(1)	0
Net Unrealized Holding Gains	561	666
Federal Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost/Amortized Cost Basis	25,454	28,042
Fair Value	27,231	29,404
Gross Unrealized Holding Gains	1,777	1,362
Gross Unrealized Holding Losses	0	0
Net Unrealized Holding Gains	1,777	1,362
Mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost/Amortized Cost Basis	6,129	6,242
Fair Value	6,392	6,356
Gross Unrealized Holding Gains	290	144
Gross Unrealized Holding Losses	(27)	(30)
Net Unrealized Holding Gains	263	114
Municipal government [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost/Amortized Cost Basis	1,000	1,000
Fair Value	1,004	1,002
Gross Unrealized Holding Gains	4	2
Gross Unrealized Holding Losses	0	0
Net Unrealized Holding Gains	4	2
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Equity Securities, Cost/Amortized Cost Basis	212	2,381
Fair Value	206	12,064
Gross Unrealized Holding Gains	0	9,683
Gross Unrealized Holding Losses	(6)	0
Net Unrealized Holding Gains	$ (6)	$ 9,683

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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