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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2018 | Jan. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2018 | Jul. 31, 2017 | Oct. 31, 2019 | Oct. 31, 2018
Income Taxes [Line Items] |  |  |  |  |  |  |
Net discrete tax benefit from remeasurement of deferred taxes at new rate due to Tax Act | $ 4.2 | $ 28.5 | $ 15.8 | $ 21.5 | $ 15.8 |  |
One-time transition tax on deemed repatriation of indefinitely reinvested earnings |  | $ 7.0 |  |  |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Increase in Provisional Income Tax Expense (Benefit) | (0.2) |  |  |  |  |  |
Unrecognized tax benefits, interest on income tax expense | 0.7 |  | $ 1.2 | 0.6 | 1.2 |  |
Income tax benefit related to vesting of share-based compensation awards | $ 1.6 |  |  | 3.1 | 2.7 |  |
Effective Income Tax Reconciliation, Deduction Energy Efficient Government Buildings, Amount |  |  |  | 2.6 |  |  |
Discrete tax benefit related to enactment of Tax Act |  |  |  | 4.1 |  |  |
Increase (decrease) in tax credits, work opportunity tax credit |  |  |  | $ 1.5 | $ 1.8 |  |
Forecast |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
U.S. statutory federal rate (percent) |  |  |  |  |  | 21.00% | 23.30%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -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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