Earnings Per Share Attributable to Matthews' Shareholders (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net (loss) income attributable to Matthews shareholders	$ (10,466)	$ 3,097
Weighted-average shares outstanding [Abstract]
Basic shares (in shares)	31,136	31,604
Effect of dilutive securities (in shares)	0	130
Diluted shares (in shares)	31,136	31,734
Antidilutive securities excluded from dilution calculation (in shares)	0	0