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Warranties - Additional Information (Details)	9 Months Ended
	Jun. 30, 2020
Minimum
Product Warranty Liability [Line Items]
Product warranty term	6 months
Maximum
Product Warranty Liability [Line Items]
Product warranty term	5 years

X

- Definition

Standard product, warranty term.

+ References

No definition available.

+ Details

Name:	osk_StandardProductWarrantyTerm
Namespace Prefix:	osk_
Data Type:	xbrli:durationItemType
Balance Type:	na
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_ProductWarrantyLiabilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: