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Fair Value Measurements - Narrative (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
May 19, 2021
USD ($)
milestone
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Jan. 04, 2021
USD ($)
milestone
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Fair value of contingent consideration upon acquisition       $ 0 $ 1,142,000      
Payment of contingent consideration for business acquisition       5,002,000 5,954,000      
Equity method investments   $ 18,500,000   18,500,000   $ 20,500,000    
Impairment of non-marketable investments   0 $ 21,400,000 0        
Equity investments included in other assets   12,600,000   12,600,000   12,600,000    
Unrealized gain, before tax         6,900,000      
Impairment of long-lived assets held-for-use   0 0 0 0      
Impairment loss, before tax       9,600,000        
Impairment of non-financial assets   0 $ 0 0 $ 0      
Recurring | Level 1                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Investments for deferred compensation plan   $ 28,546,000   28,546,000   28,213,000    
Small Technology Acquisition                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Future potential earn-out payments $ 10,000,000              
Number of technical development milestones | milestone 3              
Fair value of contingent consideration upon acquisition $ 10,000,000              
Small Technology Acquisition | First Technical Development Milestone                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Payment of contingent consideration for business acquisition             $ 900,000  
Small Technology Acquisition | Second Technical Development Milestone                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Payment of contingent consideration for business acquisition           4,000,000    
Small Technology Acquisition | Third Technical Development Milestone                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Payment of contingent consideration for business acquisition       3,300,000        
Second Small Technology Acquisition                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Future potential earn-out payments               $ 3,000,000
Number of technical development milestones | milestone               2
Second Small Technology Acquisition | First Technical Development Milestone                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Payment of contingent consideration for business acquisition           $ 2,000,000    
Second Small Technology Acquisition | Second Technical Development Milestone                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Payment of contingent consideration for business acquisition       $ 1,000,000