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Stock-Based Compensation Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2022
Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, number of shares available for grant (in shares) 6,181,382      
Share-based compensation, reduction in shares available for issuance by shares issued pursuant to any appreciation award (in shares) 1      
Share-based compensation, strike price as a percentage of the fair market value of the underlying stock on the date of grant 100.00%      
Share-based compensation, reduction in shares available for issuance by shares issued pursuant to any stock award that is not an appreciation award (in shares) 1.8      
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Option Contractual Term 10 years 10 years    
Share-based compensation, vesting period 4 years 4 years    
Employee Stock Option | Vesting on first anniversary of grant date        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vesting percentage, year one 25.00% 25.00%    
Employee Stock Option | Share-based Payment Arrangement, Employee [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, grant date fair value of stock options $ 0.0 $ 0.0    
Share-based compensation, options granted (in shares) 0 0    
Employee Stock Option | Share-based Payment Arrangement, Employee [Member] | Vesting on the last day of each calendar quarter        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vesting percentage, year one 6.25% 6.25%    
Service Based RSU        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted - restricted stock units 563,000 673,000    
Share-based compensation, grant date fair value of stock options $ 34.0 $ 26.4    
Service Based RSU | Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted - restricted stock units 44,000 54,000    
Share-based compensation, grant date fair value of stock options $ 2.3 $ 2.1    
Restricted Stock Units (RSUs) [Member] | Vesting on the last day of each calendar quarter | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vesting percentage, year one 150.00% 150.00%    
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Vesting on first anniversary of grant date        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vesting percentage, year one 50.00% 50.00%    
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Vesting on the last day of each calendar quarter        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vesting percentage, year one 12.50% 12.50%    
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Employee [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vesting period 4 years 4 years    
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Employee [Member] | Vesting on first anniversary of grant date        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vesting percentage, year one 25.00% 25.00%    
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Employee [Member] | Vesting on the last day of each calendar quarter        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vesting percentage, year one 6.25% 6.25%    
Restricted Stock Units (RSUs) [Member] | Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share Based Compensation Arrangement By Share Based Payment Award Ratably Vest After 100.00% 100.00%    
Restricted Stock Units (RSUs) [Member] | Director | Share-based Payment Arrangement, Nonemployee [Member] | Vesting on the last day of each calendar quarter        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vesting percentage, year one 100.00% 100.00%    
Performance Based RSU        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vesting period 1 year 1 year    
Granted - restricted stock units 193,000 248,000    
Share-based compensation, grant date fair value of stock options $ 11.9 $ 9.7    
Performance Based RSU | Executives        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vesting period 3 years 3 years    
Granted - restricted stock units 134,000 167,000    
Share-based compensation, grant date fair value of stock options $ 8.2 $ 6.5    
Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period 2 years 2 years    
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease)     55,000 50,000
Performance Based RSU | Executives | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vesting percentage, year one 0.00% 0.00%    
Performance Based RSU | Executives | Vesting on first anniversary of grant date        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vesting percentage, year one 50.00% 50.00%    
Performance Based RSU | Executives | Vesting on the last day of each calendar quarter        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vesting percentage, year one 50.00% 50.00%    
Outstanding Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted - restricted stock units 989,000 976,000