| Cover | Feb. 26, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 26, 2020 |
| Entity File Number | 1-31371 |
| Entity Registrant Name | Oshkosh Corporation |
| Entity Central Index Key | 0000775158 |
| Entity Tax Identification Number | 39-0520270 |
| Entity Incorporation, State or Country Code | WI |
| Entity Address, Address Line One | P.O. Box 2566 |
| Entity Address, City or Town | Oshkosh |
| Entity Address, State or Province | WI |
| Entity Address, Postal Zip Code | 54903-2566 |
| City Area Code | 920 |
| Local Phone Number | 502-3009 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock ($0.01 par value) |
| Trading Symbol | OSK |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
