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Auction Rate Securities (Tables)
12 Months Ended
Oct. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Significant Assumptions Used to Determine Fair Value of Auction Rate Securities
Significant Assumptions Used to Determine the Fair Value of Our Auction Rate Security
Assumption
 
October 31, 2019
 
October 31, 2018
Discount rates
 
L + 0.34%
 
L + 0.37%
Yields
 
L + 2.00%
 
L + 2.00%
Average expected lives
 
4 years
 
4 years

L One Month LIBOR