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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 31, 2019 | Jul. 31, 2019 | Jul. 31, 2018 | Oct. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Retained earnings | $ 3,003,430 | $ 3,003,430 |  | $ 2,543,688
Decrease to unbilled receivables | (38,965) | (38,965) |  | (36,699)
Contract assets | 205,822 | 205,822 |  | 126,897
Decrease in deferred revenue | (1,230,222) | (1,230,222) |  | (1,104,110)
Capitalized incremental costs to obtain contracts | 94,600 | 94,600 |  |
Revenue recognized | 470,600 | 1,432,100 |  |
Unsatisfied or partly unsatisfied performance obligations | 4,300,000 | 4,300,000 |  |
Non-cancellable FSA commitments | $ 463,500 | $ 463,500 |  |
Performance obligations recognized over next 12 months | 56.00% | 56.00% |  |
Amortization of capitalized costs to obtain revenue contracts | $ 17,800 | $ 46,230 | $ 0 |
Adjustments | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Retained earnings | (306,386) | (306,386) |  | 265,100
Decrease to unbilled receivables |  |  |  | 27,400
Contract assets |  |  |  | 126,900
Decrease in deferred revenue |  |  |  | 165,600
Capitalized incremental costs to obtain contracts |  |  |  | 73,800
Deferred tax liabilities |  |  |  | $ 81,400
Sales Based Royalties |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenue recognized | $ 17,500 | $ 64,800 |  |

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