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Intangible Assets (Tables)
 9 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]    
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]  
Year Ended June 30,Amortization Expense
 (Dollars in Thousands)
2023$481,372 
2024480,593 
2025467,245 
2026376,541 
2027376,470 
Thereafter2,500,560 
Total$4,682,781 
Intangible assets
Intangible assets consist of the following as of June 30, 2022 and September 30, 2021:

Developed TechnologyTrademarksCustomer Relationships and BacklogCapitalized Software and OtherTotal
June 30, 2022:
Gross carrying amount$1,882,037 $464,400 $3,072,738 $10,149 $5,429,324 
Less: Accumulated amortization(153,758)(9,379)(144,888)(8,518)(316,543)
Net carrying amount$1,728,279 $455,021 $2,927,850 $1,631 $5,112,781 


Developed TechnologyTrademarksCustomer Relationships and BacklogCapitalized Software and OtherTotal
September 30, 2021:
Gross carrying amount$532,095 $34,400 $462,506 $11,986 $1,040,987 
Less: Accumulated amortization(97,313)(6,047)(88,621)(11,351)(203,332)
Net carrying amount$434,782 $28,353 $373,885 $635 $837,655 


The increase in intangible asset balances in 2022 was primarily due to the Heritage AspenTech acquisition. See Note 4, "Acquisitions".
Total intangible asset amortization expense for fiscal year 2022, 2021 and 2020 was $116.7 million, $120.3 million and $24.6 million, respectively. The increase in amortization for 2022 and 2021 was due to the Heritage AspenTech and OSI Inc. acquisitions, respectively.