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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 | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Guarantee Obligations [Line Items] |  |  |  |
Balance at beginning of period | $ 13.8 | $ 16.2 | $ 15.5 | $ 15.8
Adoption of ASC 326 |  |  | (0.6) |
Provision for new credit guarantees | 0.6 | 0.5 | 1.5 | 3.7
Changes for pre-existing guarantees, net | (0.2) | (1.8) | (0.4) | (0.4)
Amortization of previous guarantees | (0.4) | 0.2 | (2.3) | (4.0)
Foreign currency translation |  | 0.1 | 0.1 | 0.1
Balance at end of period | $ 13.8 | $ 15.2 | $ 13.8 | $ 15.2

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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

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- 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 Guarantee obligations decrease due to adoption of ASU 201911. + References No definition available. + Details
Name: | osk_GuaranteeObligationsDecreaseDueToAdoptionOfASU201911
Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
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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
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Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |