Document and Entity Information - shares
9 Months Ended
Dec. 31, 2016
Jan. 27, 2017
Document and Entity Information [Abstract]    
Entity Registrant Name Rexnord Corp  
Entity Central Index Key 0001439288  
Document Type 10-Q  
Document Period End Date Dec. 31, 2016  
Amendment Flag false  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --03-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding (in shares)   103,426,972