| Cover | Sep. 01, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 1, 2021 |
| Entity File Number | 001-35475 |
| Entity Registrant Name | REXNORD CORPORATION |
| Entity Central Index Key | 0001439288 |
| Entity Tax Identification Number | 20-5197013 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 511 W. Freshwater Way |
| Entity Address, City or Town | Milwaukee |
| Entity Address, State or Province | WI |
| Entity Address, Postal Zip Code | 53204 |
| City Area Code | 414 |
| Local Phone Number | 643-3739 |
| Written Communications | true |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock $.01 par value |
| Trading Symbol | RXN |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
