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Guarantee Arrangements - Additional Information (Details) $ in Millions	Sep. 30, 2020 USD ($)
Indirect Guarantee of Deferred Payment and Lease Payment Agreements
Guarantee Obligations [Line Items]
Aggregate indebtedness to customers under credit guarantees	$ 749.8
Estimated maximum loss exposure under contracts	150.2
Residual Value Guarantee
Guarantee Obligations [Line Items]
Estimated maximum loss exposure under contracts	11.9
Customer equipment value including a residual value guarantee	$ 92.7

X

- 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

X

- 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

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

- 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

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=osk_ResidualValueGuaranteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: