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Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified

Mar. 31, 2013

Sep. 30, 2012

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial assets measured at fair value

$ 63,696

$ 68,470

Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial assets measured at fair value

48,408

50,168

Money market instruments

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial assets measured at fair value

19,313

34,317

Money market instruments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial assets measured at fair value

19,313

^[1]

34,317

^[1]

Semiconductor Manufacturing International Corp. | Available-for-sale Securities

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial assets measured at fair value

1,771

1,099

Semiconductor Manufacturing International Corp. | Available-for-sale Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial assets measured at fair value

1,771

^[2]

1,099

^[2]

Nanya Technology Corporation | Available-for-sale Securities

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial assets measured at fair value

27,324

14,752

Nanya Technology Corporation | Available-for-sale Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial assets measured at fair value

$ 27,324

^[3]

$ 14,752

^[3]

[1]	Included in cash and cash equivalents
[2]	Included in short-term investments
[3]	Included in short-term investments at March 31, 2013 and other assets at September 30, 2012.

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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