Revenue Recognition - Additional Information (Details 1) $ in Millions	Mar. 31, 2022 USD ($)
Disaggregation Of Revenue [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 9,150
Transaction price allocated to performance obligations to be satisfied during remaining fiscal 2022	3,080
Transaction price allocated to performance obligations to be satisfied during fiscal 2023	2,360
Transaction price allocated to performance obligations to be satisfied beyond fiscal 2023	$ 3,700

Amount of transaction price allocated to performance obligations expected to be satisfied during subsequent fiscal year.

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Transaction price allocated to performance obligations expected to be satisfied beyond current fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	osk_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Transaction price allocated to performance obligations to be satisfied during current fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	osk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_DisaggregationOfRevenueAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant