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Leases (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Jun. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Lessee, Lease, Description [Line Items]      
Lessor, Operating Lease, Option to Terminate 60 days    
Operating Lease, Cost $ 4,769 $ 6,365 $ 3,521
Operating Lease, Weighted Average Remaining Lease Term 9 years 7 years 7 months 6 days  
Operating Lease, Weighted Average Discount Rate, Percent 3.00% 2.20%  
2023 $ 3,658    
2024 14,587    
2025 13,504    
2026 8,865    
2027 6,452    
Thereafter 42,728    
Total lease payments 89,794    
Total lease payments (10,670)    
Less: imputed interest 79,124    
Operating lease right-of-use assets 78,286 $ 46,048  
Current operating lease liabilities 7,191 5,744  
Non-current operating lease liabilities 71,933 41,114  
Variable Lease, Cost 518 797 345
Short-term Lease, Cost 723 $ 889 $ 620
Heritage AspenTech      
Lessee, Lease, Description [Line Items]      
Operating lease right-of-use assets $ 32,200    
Minimum      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 13 years    
Lessee, Operating Lease, Renewal Term 5 years