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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2019 | Jan. 31, 2018 | Nov. 01, 2018 | Oct. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Retained earnings | $ 2,820,910 |  |  | $ 2,543,688
Decrease to unbilled receivables | (36,922) |  |  | (36,699)
Contract assets | 167,729 |  |  | 126,897
Decrease in deferred revenue | (1,325,214) |  |  | $ (1,104,110)
Capitalized incremental costs to obtain contracts | 95,700 |  |  |
Revenue recognized | 487,100 |  |  |
Unsatisfied or partly unsatisfied performance obligations | 4,300,000 |  |  |
Non-cancellable FSA commitments | $ 432,500 |  |  |
Performance obligations recognized over next 12 months | 50.00% |  |  |
Amortization of capitalized costs to obtain revenue contracts | $ 12,793 | $ 0 |  |
Adjustments | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Retained earnings | $ (285,452) |  | $ 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 |

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