Auction Rate Securities

3 Months Ended

Jan. 31, 2018

Investments, Debt and Equity Securities [Abstract]

AUCTION RATE SECURITIES

At January 31, 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.

At January 31, 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	January 31, 2018	October 31, 2017
Discount rates	L + 0.53% and L + 1.18%	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