Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Contract assets	$ 111,366		$ 107,147
Transferred over Time
Disaggregation of Revenue [Line Items]
Contract assets	$ 109,834		$ 99,700
Revenue Benchmark \| Product Concentration Risk \| Transferred over Time
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	11.00%	12.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

MATTHEWS INTERNATIONAL CORP 10-Q