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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2019 | Oct. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Apr. 30, 2019 | Apr. 30, 2018 | Oct. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
U.S. statutory federal rate (percent) |  |  |  |  | 21.00% |  | 23.30%
Net discrete tax benefit from remeasurement of deferred taxes at new rate due to Tax Act |  |  |  | $ 28.7 |  |  |
One-time transition tax on deemed repatriation of indefinitely reinvested earnings |  |  |  | $ 7.0 |  |  |
Increase tax benefit from remeasurement of deferred taxes at new rate due to Tax Act |  | $ 29.6 |  |  |  |  |
Remeasurement of one-time transition tax on deemed repatriation of indefinitely reinvested earnings |  | $ (4.5) |  |  |  |  |
Increase (decrease) in tax credits, work opportunity tax credit | $ (1.3) |  | $ (1.5) |  | $ (1.4) | $ (1.5) |
Unrecognized tax benefits, interest on income tax expense | 0.7 |  |  |  | 1.4 |  |
Income tax benefit related to vesting of share-based compensation awards | $ (0.3) |  |  |  | $ (0.8) | (1.5) |
Tax deductions for energy efficient government buildings |  |  | $ (2.0) |  |  | (2.3) |
Discrete tax benefit, provision income tax expense benefit |  |  |  |  |  | $ 21.7 |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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