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Auction Rate Securities | 6 Months Ended
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Apr. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Auction Rate Securities | 7. AUCTION RATE SECURITIES
At April 30, 2018 and October 31, 2017, we held investments in auction rate securities from two different issuers that had an aggregate original principal amount of $10.0 million and an amortized cost and fair value of $8.0 million. These two auction rate securities are debt instruments with stated maturities in 2036 and 2050. The interest rates for these securities are designed to be reset through Dutch auctions approximately every thirty days, but auctions for these securities have not occurred since August 2007. On May 16, 2018, we sold one of our auction rate securities with an original par value of $5.0 million and an amortized cost basis of $3.0 million for proceeds of $2.9 million. At April 30, 2018 and October 31, 2017, there were no unrealized gains or losses on our auction rate securities included in accumulated other comprehensive income (loss), net of taxes (“AOCI”), and the total amount of other-than-temporary impairment credit loss on our auction rate security investments included in our retained earnings was $2.0 million. Significant Assumptions Used to Determine the Fair Values of Our Auction Rate Securities
Assumption |  | April 30, 2018 |  | October 31, 2017
Discount rates |  | L + 0.47% and L + 0.74% |  | L + 0.42% and L + 0.79%
Yields |  | 2.15%, L + 2.00% |  | 2.15%, L + 2.00%
Average expected lives |  | 4 – 10 years |  | 4 – 10 years
L – One Month LIBOR

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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