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Investments - Short-Term Investments (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Sep. 30, 2011
--- | --- | ---
Trading: |  |
Marketable equity securities | $ 146,842 | $ 262,085
Marketable debt securities |  | 12,665
Trading Securities, Total | 146,842 | 274,750
Held to maturity: |  |
Held-to-maturity Securities | 34,986 | 75,888
Total short-term investments | 181,828 | 350,638
U.S. Treasury securities [Member] |  |
Held to maturity: |  |
Held-to-maturity Securities | 34,735 | 75,638
Certificate of deposit [Member] |  |
Held to maturity: |  |
Held-to-maturity Securities | $ 251 | $ 250

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- Definition This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities within one year of the balance sheet date or the normal operating cycle, whichever is longer; such investments are measured at amortized cost (carrying value). The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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