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Summary of Significant Accounting Policies - Components of Accounts Receivables (Details) - USD ($) $ in Thousands | Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
--- | --- | --- | --- | ---
Accounts Receivable, Net |  |  |  |
Accounts receivable | $ 758,341 | $ 524,766 |  |
Unbilled accounts receivable | 50,932 | 38,175 |  |
Total accounts receivable | 809,273 | 562,941 |  |
Less allowance for doubtful accounts | (28,564) | (9,046) | $ (5,613) | $ (5,165)
Total accounts receivable, net | $ 780,709 | $ 553,895 |  |

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