Earnings per share (Tables)

6 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule of earnings per share, basic and diluted

The following table sets forth the computation of basic and diluted loss from continuing operations per common share (in thousands, except per share amounts):

	Three Months Ended March 31,				Six Months Ended March 31,
	2017		2018		2017			2018
Numerator:
Numerator for basic and diluted loss per common share—Net (loss) income attributable to Evoqua Water Technologies	$	3,198	$	12,503	$	(10,401	)	$	8,790
Denominator:
Denominator for basic net (loss) income per common share—weighted average shares	104,632		113,770		104,632			113,770
Effect of dilutive securities:
Share‑based compensation	3,109		5,445		—			5,773
Denominator for diluted net loss per common share—adjusted weighted average shares	107,741		119,215		104,632			119,543
Basic (loss) income attributable to Evoqua Water Technologies per common share	$	0.03	$	0.11	$	(0.10	)	$	0.08
Diluted (loss) income attributable to Evoqua Water Technologies per common share	$	0.03	$	0.10	$	(0.10	)	$	0.07