Earnings Per Share Attributable to Matthews' Shareholders (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income attributable to Matthews shareholders	$ 14,629	$ 24,414	$ 33,143	$ 77,776
Weighted-average shares outstanding [Abstract]
Basic shares (in shares)	31,347	31,631	31,487	31,693
Effect of dilutive securities (in shares)	147	150	138	132
Diluted shares (in shares)	31,494	31,781	31,625	31,825
Antidilutive securities excluded from dilution calculation (in shares)	0	0	0	0