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v3.20.2

Business Segment Information - Schedule of Depreciation, Amortization and Capital Expenditure by Segment (Parenthetical) (Details) $ in Millions | 12 Months Ended
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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: |