Investments

12 Months Ended

Oct. 31, 2011

Investments [Abstract]

Investments

Note 3. Investments

The following table summarizes the amortized cost basis and fair value of our investments in U.S. treasury securities at October 31, 2011 and 2010:

			Gross		Gross
	Amortized		unrealized		unrealized
	cost		gains		(losses)		Fair value
U.S. government obligations
At October 31, 2011	$	12,016	$	14	$	—	$	12,030
At October 31, 2010	$	34,090	$	74	$	—	$	34,164

	2011		2010
Reported as:
Short-term investments	$	12,016	$	25,019
Long-term investments		—		9,071
	$	12,016	$	34,090

As of October 31, 2011, investment securities had maturity dates ranging from November 15, 2011 to March 15, 2012, and estimated yields ranging from 1.13 percent to 1.75 percent, with a weighted average yield of 1.32 percent.