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Revenue recognition (Details) | 9 Months Ended
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Jul. 31, 2019
Revenue recognition |
Revenue, Practical Expedient, Initial Application and Transition, Completed Contract, Use of Transaction Price at Contract Completion Date [true false] | true
Revenue, Practical Expedient, Incremental Cost of Obtaining Contract [true false] | true

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Indicates (true false) whether practical expedient was elected to recognize incremental cost of obtaining contract as expense when incurred if amortization period would have been one year or less. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL51790836-203054 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130569-203045 + Details
Name: | us-gaap_RevenuePracticalExpedientIncrementalCostOfObtainingContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:booleanItemType
Balance Type: | na
Period Type: | duration

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- Definition Indicates (true false) whether practical expedient was elected under initial application of retrospective method to use transaction price at date when contract with variable consideration was completed. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=113356391&loc=SL49131195-203048 + Details
Name: | us-gaap_RevenuePracticalExpedientInitialApplicationAndTransitionCompletedContractUseOfTransactionPriceAtContractCompletionDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:booleanItemType
Balance Type: | na
Period Type: | duration