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Business Combinations - Narrative (Details)
 4 Months Ended 12 Months Ended
May 28, 2021
USD ($)
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Business Acquisition [Line Items]          
Acquisition-related costs and expenses     $ 8,951,000 $ 6,575,000 $ 7,563,000
ID R&D          
Business Acquisition [Line Items]          
Aggregate purchase price $ 49,000,000        
Initial cash payment paid for acquisition $ 13,000,000        
Common stock issued during acquisition (in shares) | shares 867,226        
Common stock issued during acquisition, value $ 13,900,000        
Earnout period 1 year        
Maximum payout of contingent consideration liability   $ 22,100,000 22,100,000    
Earnout period shift 1 year        
Fair value of earnout consideration $ 15,700,000        
Acquisition-related costs and expenses 600,000   $ 1,100,000    
Escrow deposit $ 4,000,000        
Period to maintain escrow funds 24 months        
Goodwill expected to be deductible for income tax purposes $ 0        
Revenue from business combinations   800,000      
Net loss from business combinations   $ 3,000,000      
ID R&D | Earnout Shares          
Business Acquisition [Line Items]          
Shares issuable (up to) (in shares) | shares 711,535        
Acquisition-related costs and expenses       $ 0 $ 0
ID R&D | First Earnout Anniversary          
Business Acquisition [Line Items]          
Earnout period 1 year        
Maximum payout of contingent consideration liability $ 12,300,000        
Earnout percentage 0.15        
ID R&D | Second Earnout Anniversary          
Business Acquisition [Line Items]          
Earnout period 1 year        
Maximum payout of contingent consideration liability $ 9,800,000