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Business Segment Information - Schedule of Depreciation, Amortization and Capital Expenditure by Segment (Parenthetical) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |
Accelerated depreciation related to restructuring | $ 3.6 | $ 6.9
Access Equipment |  |
Segment Reporting Information [Line Items] |  |
Accelerated depreciation related to restructuring | $ 3.6 | 2.8
Commercial |  |
Segment Reporting Information [Line Items] |  |
Accelerated depreciation related to restructuring |  | $ 4.1

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_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: |