XML 17 R1.htm IDEA: XBRL DOCUMENT v3.8.0.1
Document and Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2017
Nov. 17, 2017
Mar. 31, 2017
Sep. 30, 2016
Document Information [Line Items]        
Document Fiscal Period Focus FY      
Document Period End Date Sep. 30, 2017      
Document Fiscal Year Focus 2017      
Entity Well-known Seasoned Issuer No      
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-K      
Property, plant and equipment, net $ 122,300,000     $ 108,400,000
Intangible Assets, Net (Including Goodwill) $ 439,300,000     $ 434,600,000
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Amendment Flag false      
Entity Common Stock, Shares Outstanding   158,061,628    
Entity Public Float     $ 1,856,526,077