FAIR VALUE MEASUREMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Short-term investments
Available-for-sale securities
Amortized Cost	$ 108,552	$ 170,809
Gross Unrealized Gains	14	53
Gross Unrealized Losses	(20)	(28)
Fair Value	108,546	170,834
Short-term investments \| Corporate debentures/bonds
Available-for-sale securities
Amortized Cost	75,578	78,176
Gross Unrealized Gains	14	21
Gross Unrealized Losses	(20)	(28)
Fair Value	75,572	78,169
Short-term investments \| Commercial paper
Available-for-sale securities
Amortized Cost	28,974	40,331
Gross Unrealized Gains		3
Fair Value	28,974	40,334
Short-term investments \| Government agency bonds
Available-for-sale securities
Amortized Cost		26,573
Gross Unrealized Gains		9
Fair Value		26,582
Short-term investments \| U.S. Treasury bills
Available-for-sale securities
Amortized Cost		20,000
Gross Unrealized Gains		18
Fair Value		20,018
Short-term investments \| Certificates of deposit
Available-for-sale securities
Amortized Cost	4,000	5,729
Gross Unrealized Gains		2
Fair Value	4,000	5,731
Cash equivalents
Available-for-sale securities
Amortized Cost	16,549	13,698
Fair Value	16,549	13,698
Cash equivalents \| Money market funds
Available-for-sale securities
Amortized Cost	16,549	13,698
Fair Value	$ 16,549	$ 13,698

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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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- Definition

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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