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Auction Rate Securities - Significant Assumptions Used to Determine Fair Value of Auction Rate Securities (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Oct. 31, 2017
Schedule of Available-for-sale Securities [Line Items] |  |
Libor plus stated yield | 2.00% | 2.00%
Yields | 2.15% | 2.15%
Minimum |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Discount rates | 0.53% | 0.42%
Average expected lives | 4 years | 4 years
Maximum |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Discount rates | 1.18% | 0.79%
Average expected lives | 10 years | 10 years

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- Definition The average expected life assumptions used to determine the fair value of auction rate securities. + References No definition available. + Details
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- Definition The discount rate over London Interbank Offered Rate assumptions used to determine the fair value of auction rate securities. + References No definition available. + Details
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- Definition The fixed yield used as an input in determining the fair value for one of the Company's auction rate securities. + References No definition available. + Details
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- Definition The fixed yield over London Interbank Offered Rate used as an input in determining the fair value for the one of the Company's auction rate securities. + References No definition available. + Details
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