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Investments | 12 Months Ended
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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.

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- Definition The entire disclosure for investment holdings. This includes the long positions of investments for the entity. It contains investments in affiliated and unaffiliated issuers. The investments include securities and non securities (i.e. commodities and futures contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Article 12 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611282-123010 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Article 12 + Details
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