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Guarantee Arrangements - Schedule of Provision for Losses on Customer Guarantees (Details1) - Indirect Guarantee of Deferred Payment and Lease Payment Agreements - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Guarantee Obligations [Line Items] |  |
Balance at beginning of year | $ 15.8 | $ 10.4
Provision for new credit guarantees | 4.9 | 9.9
Changes for pre-existing guarantees, net | (0.5) | (0.5)
Amortization of previous guarantees | (5.0) | (3.8)
Foreign currency translation | 0.3 | (0.2)
Balance at end of year | $ 15.5 | $ 15.8

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- Definition Represents the reduction in the provision for losses related to the amortization of previous guarantees. + References No definition available. + Details
Name: | osk_GuaranteeObligationsAmortizationOfPreviousGuarantees
Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase or decrease in guarantee obligations liability due to currency translation. + References No definition available. + Details
Name: | osk_GuaranteeObligationsCurrencyTranslationIncreaseDecrease
Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the reserve to cover probable loss on account of customer guarantee obligations as of the balance sheet date. + References No definition available. + Details
Name: | osk_GuaranteeObligationsLossProvision
Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the aggregate increase or decrease in the liability during the reporting period for accruals related to preexisting guarantee obligations. + References No definition available. + Details
Name: | osk_GuaranteeObligationsPreexistingIncreaseDecrease
Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the provision for loss on customer guarantee obligations attributable to new guarantees issued during the period. + References No definition available. + Details
Name: | osk_GuaranteeObligationsProvisionForLossNewGuarantees
Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | us-gaap_GuaranteeObligationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=osk_IndirectGuaranteeOfDeferredPaymentAndLeasePaymentAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |