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Document and Entity Information - shares
 9 Months Ended
Jun. 30, 2019
Jul. 31, 2019
Document And Entity Information [Abstract]    
Document Fiscal Period Focus Q3  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Entity Registrant Name MUELLER WATER PRODUCTS, INC.  
Entity Central Index Key 0001350593  
Current Fiscal Year End Date --09-30  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Entity Current Reporting Status Yes  
Entity Emerging Growth Company false  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   157,355,301
Entity Small Business false