Earnings per share (Tables)

12 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Schedule of earnings per share, basic and diluted

The following table sets forth the computation of basic and diluted income from continuing operations per common share:

	Year Ended September 30,
(In thousands, except per share data)	2021		2020		2019
Numerator:
Net income (loss) attributable to Evoqua Water Technologies Corp.	$	51,482	$	113,649	$	(9,523)
Denominator:
Denominator for basic net income per common share—weighted average shares	119,575		116,721		114,703
Effect of dilutive securities:
Share‑based compensation	3,368		4,342		—
Denominator for diluted net loss per common share—adjusted weighted average shares	122,943		121,063		114,703
Basic income (loss) per common share	$	0.43	$	0.97	$	(0.08)
Diluted income (loss) per common share	$	0.42	$	0.94	$	(0.08)