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Earnings per share (Tables)
 12 Months Ended
Sep. 30, 2018
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)
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Net income attributable to Evoqua Water Technologies Corp.
$
6,135

 
$
2,163

 
$
11,639

Denominator:
 
 
 
 
 
Denominator for basic net income per common share—weighted average shares
113,944

 
104,964

 
104,254

Effect of dilutive securities:
 
 
 
 
 
Share‑based compensation
6,221

 
4,724

 
1,907

Denominator for diluted net loss per common share—adjusted weighted average shares
120,165

 
109,688

 
106,161

Basic earnings per common share
$
0.05

 
$
0.02

 
$
0.11

Diluted earnings per common share
$
0.05

 
$
0.02

 
$
0.11