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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
May 18, 2021
Apr. 01, 2021
Oct. 01, 2020
Dec. 21, 2018
Oct. 01, 2018
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Feb. 18, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Intrinsic value, exercises in period               $ 51,448      
Employee Stock Ownership Plan (ESOP), Shares in ESOP       11,297              
Common stock, par value (in dollars per share)           $ 0.01   $ 0.01   $ 0.01  
Non-cash share-based compensation           $ 4,228 $ 2,520 $ 10,461 $ 8,504    
Share-based Compensation expense           5,526 2,542 11,816 8,559    
Compensation cost not yet recognized, period for recognition           $ 22,934   22,934      
Fair value of options vested               4,371      
Proceeds from issuance of common stock               $ 18,096 9,596    
Granted (shares)               611      
Employee Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Employee Stock Ownership Plan (ESOP), Shares in ESOP       5,000              
Equity incentive plan, number of shares authorized (shares)           5,100   5,100     5,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant           4,336   4,336      
Purchase price of stock, percentage         85.00%            
Purchase period         6 months            
Employee Stock Ownership Plan (ESOP), Compensation Expense           $ 249 $ 153 $ 652 $ 227    
Shares issued under ESPP   62 120                
Employee Stock Option                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Equity incentive plan, number of shares authorized (shares)           11,083   11,083      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant           2,177   2,177      
Compensation cost not yet recognized, period for recognition           $ 10,309   $ 10,309      
Period for recognition for unrecognized compensation expense               2 years 3 months 18 days      
Restricted Stock Units (RSUs)                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Period for recognition for unrecognized compensation expense               2 years 4 months 24 days      
Vested in period (shares)               239      
Employee Stock Purchase Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock, par value (in dollars per share)       $ 0.01              
Special RSU                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Compensation cost not yet recognized, period for recognition           $ 7,611   $ 7,611      
Period for recognition for unrecognized compensation expense               2 years 10 months 24 days      
Granted (shares) 234                    
Special PSUs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted (shares) 469                    
Evoqua Water Technologies Corp. Stock Option Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Contractual term of options               10 years      
Stock awards vesting percentage           25.00%