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Equity-Based Compensation (Schedule of Number of Awards and Weighted Average Grant Date Fair Value) (Details) - $ / shares
3 Months Ended 9 Months Ended
Dec. 31, 2021
Mar. 31, 2022
Sep. 30, 2020
Sep. 30, 2019
Performance stock units (1)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards (in shares)     129,513 183,908
Weighted average grant date fair value (in USD per share)     $ 53.30 $ 40.49
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards (in shares)     74,247 144,172
Weighted average grant date fair value (in USD per share)     $ 56.24 $ 39.43
Deferred stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards (in shares)     12,402 7,509
Weighted average grant date fair value (in USD per share)     $ 45.98 $ 37.95
Common shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards (in shares)     4,134 7,509
Weighted average grant date fair value (in USD per share)     $ 45.98 $ 37.95
Scenario, Forecast | Performance stock units (1)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares to be issued on conversion (in shares) 38,488      
2018 Plan | Performance stock units (1)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares to be issued on conversion as percentage of total award     116.00%  
2018 Plan | Scenario, Forecast | Performance stock units (1)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares to be issued on conversion (in shares)   168,688    
Minimum | Performance stock units (1)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants based on targeted thresholds, percent     0.00%  
Maximum | Performance stock units (1)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants based on targeted thresholds, percent     200.00%  
Return on Invested Capital | 2018 Plan | Performance stock units (1)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance period     1 year  
Gross Profit Threshold | Minimum | 2018 Plan | Performance stock units (1)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance period     2 years  
Gross Profit Threshold | Maximum | 2018 Plan | Performance stock units (1)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance period     3 years  
Total Shareholder Return | 2018 Plan | Performance stock units (1)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance period     3 years