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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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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Fair Value of Financial Instruments (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Corporate bonds [Member]	Sep. 30, 2011 Corporate bonds [Member]	Sep. 30, 2012 Government Bonds [Member]	Sep. 30, 2011 Government Bonds [Member]	Mar. 31, 2012 Foreign Exchange Forward [Member]	Sep. 30, 2012 Level 1 [Member]	Sep. 30, 2011 Level 1 [Member]	Sep. 30, 2012 Level 1 [Member] Corporate bonds [Member]	Sep. 30, 2011 Level 1 [Member] Corporate bonds [Member]	Sep. 30, 2012 Level 1 [Member] Government Bonds [Member]	Sep. 30, 2011 Level 1 [Member] Government Bonds [Member]	Sep. 30, 2012 Level 2 [Member]	Mar. 31, 2012 Level 2 [Member] Foreign Exchange Forward [Member]
Fair value measurement of the Company's short-term investments
Short-term investment fair value disclosure			$ 11,109	$ 3,872	$ 8,851	$ 1,054				$ 11,109	$ 3,872	$ 8,851	$ 1,054
Foreign currency forward contract							(215)								(215)
Total	$ 19,745	$ 4,926						$ 19,960	$ 4,926					$ (215)