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Auction Rate Securities (Tables)
12 Months Ended
Oct. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Significant Assumptions Used to Determine Fair Value of Auction Rate Securities
Significant Assumptions Used to Determine the Fair Values of Our Auction Rate Securities
Assumption
 
October 31, 2017
 
October 31, 2016
Discount rates
 
L + 0.42% and L + 0.79%
 
L + 0.46% and L + 1.30%
Yields
 
2.15%, L + 2.00%
 
2.15%, L + 2.00%
Average expected lives
 
4 – 10 years
 
4 – 10 years

L One Month LIBOR