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Business Segment Information - Schedule of Depreciation, Amortization and Capital Expenditure by Segment (Parenthetical) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Accelerated depreciation related to restructuring	$ 6.9
Access Equipment
Segment Reporting Information [Line Items]
Accelerated depreciation related to restructuring	2.8
Commercial
Segment Reporting Information [Line Items]
Accelerated depreciation related to restructuring	$ 4.1

X

- Definition

Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringReserveAcceleratedDepreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=osk_AccessEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=osk_CommercialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: