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Leases - Narrative (Details) $ in Thousands, ft² in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2020 USD ($) ft² | Jan. 31, 2019 USD ($) | Oct. 31, 2019 USD ($) | Oct. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |
Area leased (in sq ft) | ft² | 1.4 |  |  |
Remaining lease term (up to) | 13 years |  |  |
Extension term (up to) | 10 years |  |  |
Termination period (up to) | 8 years |  |  |
Restructuring reserve | $ 2,232 | $ 2,563 | $ 15,143 | $ 3,847
Operating lease expense |  | 6,800 |  |
Leasehold improvements |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Amortization | $ 4,300 | $ 2,400 |  |
Consolidation of excess facilities and other restructuring activities |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Restructuring reserve |  |  | $ 11,100 |

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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