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Guarantee Arrangements - Additional Information (Details) $ in Millions | Jun. 30, 2021 USD ($)
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Indirect Guarantee of Deferred Payment and Lease Payment Agreements |
Guarantee Obligations [Line Items] |
Aggregate indebtedness to customers under credit guarantees | $ 780.8
Estimated maximum loss exposure under contracts | 163.9
Residual Value Guarantee |
Guarantee Obligations [Line Items] |
Estimated maximum loss exposure under contracts | 14.3
Customer equipment value including a residual value guarantee | $ 85.5

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- Definition Customer equipment value including a residual value guarantee. + References No definition available. + Details
Name: | osk_EquipmentValueSoldIncludingResidualValueGuarantee
Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The aggregate amount of indebtedness of others which the Company is a party to through guarantee agreements. + References No definition available. + Details
Name: | osk_GuaranteeObligationsAggregateIndebtednessOfOthers
Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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