XML 76 R1.htm IDEA: XBRL DOCUMENT v3.3.0.814
Document and Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2015
Nov. 12, 2015
Mar. 31, 2015
Sep. 30, 2014
Document Information [Line Items]        
Document Fiscal Period Focus FY      
Document Period End Date Sep. 30, 2015      
Document Fiscal Year Focus 2015      
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      
Total intangible assets net book value $ 507,300,000     $ 533,600,000
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Amendment Flag false      
Entity Common Stock, Shares Outstanding   160,563,634    
Entity Public Float     $ 1,553,391,965