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Income Taxes - Reconciliation of U.S. Statutory Tax Rate to Effective Income Tax Rate (Details) | 12 Months Ended
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Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
U.S. statutory rate | 21.00% | 23.30% | 35.00%
State and local income taxes, net of federal tax benefit | 5.90% | 6.90% | 5.50%
Federal and state tax credits | (3.90%) | (7.80%) | (7.50%)
Impact of foreign operations | (1.00%) | 1.30% | (2.70%)
Changes in uncertain tax positions | (0.80%) | (6.70%) | (19.70%)
Incremental tax benefit from share-based compensation awards | (0.70%) | (3.90%) | (4.20%)
Tax credits for energy efficient government buildings | 0.00% | (3.20%) | (2.20%)
Impact from goodwill impairment | 0.00% | 4.40% | 0.00%
Transition tax on foreign earnings | (1.10%) | 5.10% | 0.00%
Remeasurement of U.S. deferred taxes | (0.30%) | (31.50%) | 0.00%
Nondeductible expenses | 2.10% | 2.40% | 5.70%
Other, net | (0.80%) | 0.30% | 0.10%
Effective tax rate | 20.40% | (9.40%) | 10.10%

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