Cover Page - USD ($) $ in Billions	12 Months Ended
	Mar. 31, 2020	May 08, 2020	Sep. 30, 2019
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-35475
Entity Registrant Name	REXNORD CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-5197013
Entity Address, Address Line One	511 W. Freshwater Way
Entity Address, City or Town	Milwaukee,
Entity Address, State or Province	WI
City Area Code	414
Local Phone Number	643-3739
Title of 12(b) Security	Common Stock $.01 par value
Trading Symbol	RXN
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 2.9
Entity Common Stock, Shares Outstanding (in shares)		119,725,005
Documents Incorporated by Reference	Part III of this Annual Report on Form 10-K incorporates by reference certain information from the Proxy Statement for the Registrant's annual meeting of stockholders, to be held on or about July 23, 2020, which Proxy Statement will be subsequently filed.
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--03-31
Entity Address, Postal Zip Code	53204
Entity Central Index Key	0001439288