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Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2017
Interim Period Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Severance and restructuring costs |  |  |  | $ 227 | $ 6,411 | $ 1,714 | $ 1,633 | $ 1,017 | $ 2,438 | $ 10,775 | $ 11,411 | $ 16,660
Discrete tax expense related to nondeductible acquisition costs |  |  |  |  |  |  |  |  | $ 1,070 |  |  |
Other expense related to reversal of indemnification asset resulting from effective settlement of tax exam |  |  |  |  |  | 2,722 |  |  |  |  |  |
Discrete tax benefit related to effective settlement of tax exam |  |  |  |  |  | $ 1,651 | 1,136 |  |  |  |  |
Other income on legal settlement. |  |  |  |  |  |  | 800 |  |  |  |  |
Favorable adjustment to unrecognized tax benefits |  |  |  |  |  |  | $ 1,192 |  |  | 2,682 |  |
Additional tax benefit relating to retroactive reinstatement of research and development credit |  |  |  |  |  |  |  | 2,025 |  |  | $ 2,486 |
Additional tax benefit related to dividends paid from foreign earnings tax credit |  |  |  |  |  |  |  | $ 6,184 |  | $ 6,154 |  |
Vention [Member] |  |  |  |  |  |  |  |  |  |  |  |
Interim Period Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Severance and restructuring costs | $ 1,017 | $ 703 | $ 491 |  |  |  |  |  |  |  |  |
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 benefit related to dividends paid from foreign earnings tax credit. + References No definition available. + Details
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- Definition Additional tax benefit related to retroactive reinstatement of research and development tax credit. + 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://www.xbrl.org/2003/role/presentationRef -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 Amount of increase in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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