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v3.21.2

Segment Information (Revenue and Long-Lived Assets by Geographical Areas) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | $ 1,111.0 | $ 964.1 | $ 968.0
Intangible Assets, Net (Including Goodwill) | 507.6 | 508.7 |
Total assets | $ 1,518.0 | 1,395.0 |
Document Period End Date | Sep. 30, 2021 |  |
Property, plant and equipment, net | $ 283.4 | 253.8 |
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property, plant and equipment, net | 263.9 | 234.7 |
Canada |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property, plant and equipment, net | 13.8 | 12.8 |
Other |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property, plant and equipment, net | 5.7 | 6.3 |
Mueller Co. [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 1,022.0 | 883.6 | 871.0
Intangible Assets, Net (Including Goodwill) | 473.2 | 490.8 |
Mueller Co. [Member] | Central Region [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 259.5 | 221.7 | 214.2
Mueller Co. [Member] | United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 910.7 | 787.0 | 772.8
Mueller Co. [Member] | Canada |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 81.4 | 65.5 | 69.0
Mueller Co. [Member] | Northeast Region [Member] [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 195.5 | 187.0 | 183.1
Mueller Co. [Member] | Southeast Region [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 201.0 | 161.9 | 162.7
Mueller Co. [Member] | Western Region [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 254.7 | 216.4 | 212.8
Mueller Co. [Member] | Other International Locations [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 29.9 | 31.1 | 29.2
Mueller Technologies [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 89.0 | 80.5 | 97.0
Intangible Assets, Net (Including Goodwill) | 34.4 | 17.9 |
Mueller Technologies [Member] | Central Region [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 21.2 | 19.2 | 27.8
Mueller Technologies [Member] | United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 84.3 | 76.0 | 92.0
Mueller Technologies [Member] | Northeast Region [Member] [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 15.1 | 20.2 | 20.4
Mueller Technologies [Member] | Southeast Region [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 31.2 | 22.7 | 33.5
Mueller Technologies [Member] | Western Region [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 16.8 | 13.9 | 10.3
Mueller Technologies [Member] | Other International Locations [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 4.7 | 4.5 | 5.0
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Ferguson Enterprises |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Accounts and Other Receivables, Net, Current | 32.1 | $ 26.1 |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | HDS IP Holdings, LLC [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Accounts and Other Receivables, Net, Current | $ 48.1 |  | $ 37.1
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Major Customers, Group One |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
10 largest customers | 58.00% | 53.00% | 53.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Major Customers, Group Two |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
10 largest customers | 37.00% | 34.00% | 34.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Ferguson Enterprises |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
10 largest customers | 19.00% | 17.00% | 18.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Ferguson Enterprises | Mueller Co. [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
10 largest customers | 18.00% | 16.00% | 17.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Ferguson Enterprises | Mueller Technologies [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
10 largest customers | 33.00% | 22.00% | 30.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | HDS IP Holdings, LLC [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
10 largest customers | 18.00% | 17.00% | 16.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | HDS IP Holdings, LLC [Member] | Mueller Co. [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
10 largest customers | 20.00% | 19.00% | 18.00%

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=mwa_RestOfWorldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mwa_MuellerCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=mwa_CentralRegionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=mwa_NortheastRegionMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=mwa_SoutheastRegionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=mwa_WesternRegionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=mwa_OtherInternationalLocationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mwa_MuellerTechnologiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=mwa_FergusonEnterprisesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=mwa_HdsIpHoldingsLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=mwa_SalesRevenueGoodsGrossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=mwa_MajorCustomersGroupOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=mwa_MajorCustomersGroupTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |