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Business Combinations and Asset Acquisitions (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Acquistions [Abstract]
Payments to Acquire Businesses, Net of Cash Acquired	$ 0.0	$ (0.2)

X

- Definition

Acquistions [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	mwa_
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X

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-13

+ Details

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