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v3.22.2.2

Segment Information (Revenue and Long-Lived Assets by Geographical Areas) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | $ 1,247.4 | $ 1,111.0 | $ 964.1
Intangible Assets, Net (Including Goodwill) | 459.8 | 507.6 |
Total assets | $ 1,498.1 | 1,518.0 |
Document Period End Date | Sep. 30, 2022 |  |
Property, plant and equipment, net | $ 301.6 | 283.4 |
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property, plant and equipment, net | 284.9 | 263.9 |
Canada |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property, plant and equipment, net | 12.6 | 13.8 |
Other |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property, plant and equipment, net | 4.1 | 5.7 |
Mueller Co. [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 714.1 | 617.8 | 532.2
Intangible Assets, Net (Including Goodwill) | 302.6 | 324.1 |
Mueller Co. [Member] | Central Region [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 190.9 | 155.1 | 133.6
Mueller Co. [Member] | United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 653.3 | 563.6 | 485.5
Mueller Co. [Member] | Canada |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 55.0 | 45.7 | 39.4
Mueller Co. [Member] | Northeast Region [Member] [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 125.3 | 110.4 | 95.1
Mueller Co. [Member] | Southeast Region [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 154.3 | 125.7 | 108.3
Mueller Co. [Member] | Western Region [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 182.8 | 172.4 | 148.5
Mueller Co. [Member] | Other International Locations [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 5.8 | 8.5 | 7.3
Mueller Technologies [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 533.3 | 493.2 | 431.9
Intangible Assets, Net (Including Goodwill) | 157.2 | 183.5 |
Mueller Technologies [Member] | Central Region [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 142.9 | 125.6 | 107.3
Mueller Technologies [Member] | United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 470.3 | 431.4 | 377.5
Mueller Technologies [Member] | Northeast Region [Member] [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 115.1 | 100.2 | 112.1
Mueller Technologies [Member] | Southeast Region [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 109.4 | 106.5 | 76.3
Mueller Technologies [Member] | Western Region [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 102.9 | 99.1 | 81.8
Mueller Technologies [Member] | Other International Locations [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues |  |  | 33.4
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 | 38.6 | $ 32.1 |
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 | $ 52.1 |  | $ 48.1
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Ferguson Enterprises |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
10 largest customers | 20.00% | 19.00% | 17.00%

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