Earnings Per Share Attributable to Matthews' Shareholders (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income attributable to Matthews shareholders	$ 35,180	$ 10,322
Weighted-average shares outstanding [Abstract]
Basic shares	31,738	32,250
Effect of dilutive securities	132	198
Diluted shares	31,870	32,448
Antidilutive securities excluded from dilution calculation (in shares)	0	0