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Subsequent Event - Additional Information (Detail) - USD ($) $ in Millions | Nov. 12, 2019 | Oct. 31, 2020 | Oct. 31, 2019
--- | --- | --- | ---
Minimum |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges |  |  | $ 9.0
Minimum | Scenario Forecast |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges |  | $ 9.0 |
Maximum |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges |  |  | $ 12.0
Maximum | Scenario Forecast |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges |  | $ 12.0 |
Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Restructuring and related activities, description | Pending final approval of our Board of Directors, customary regulatory approvals, and tax and legal considerations, this spin-off is expected to be completed in the second half of calendar 2020 and would create two independent publicly traded companies |  |

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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(d)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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