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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 | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Guarantee Obligations [Line Items] |  |
Balance at beginning of period | $ 15.8 | $ 10.4
Provision for new credit guarantees | 1.5 | 1.3
Changes for pre-existing guarantees, net |  | (0.9)
Amortization of previous guarantees | (1.4) | (0.7)
Foreign currency translation | 0.1 |
Balance at end of period | $ 16.0 | $ 10.1

X
- 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

X
- 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

X
- 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

X
- 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: |