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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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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer.

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