Employee Benefit Plans - Additional Information (Details) $ in Millions	3 Months Ended
Sep. 30, 2022 USD ($)
Retirement Benefits [Abstract]
Defined benefit plan, expected future employer contributions, current fiscal year	$ 20.0

Defined benefit plan expected future employer contributions, current fiscal year.

No definition available.

Name:	osk_DefinedBenefitPlanExpectedFutureEmployerContributionsInCurrentFiscalYear
Namespace Prefix:	osk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration