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Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Interim Period Costs Not Allocable [Line Items] |  |  |  |  |  |  |
Lapse of statute of limitations | $ 1,041 |  |  |  | $ 1,120 | $ 555 | $ 523
Discrete tax expense related to nondeductible acquisition costs |  |  |  |  |  | $ 1,070 |
Vention [Member] |  |  |  |  |  |  |
Interim Period Costs Not Allocable [Line Items] |  |  |  |  |  |  |
Pre-tax acquisition costs |  | $ 391 | $ 865 | $ 13,415 |  |  |
Discrete tax expense related to nondeductible acquisition costs |  |  |  | $ 2,600 |  |  |

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- Definition Additional tax expenses related to nondeductible acquisition costs. + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Details
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