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Intangible Assets (Policies)
 9 Months Ended
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible AssetsThe Company included in its amortizable intangible assets those intangible assets acquired in its business and asset acquisitions. The Company also included in its amortizable intangible assets capitalized costs relating to computer software developed for sale and for internal use. The Company amortized acquired intangible assets with finite lives over their estimated economic lives, generally using the straight-line method. Amortization expenses associated with developed technology and capitalized software development costs are included in cost of revenue, while amortization expenses associated with customer relationships and backlog are included in the selling and marketing. Amortization expenses related to internal use software are
included in each respective financial statement line based on which business the software is attributable to. Each period, the Company evaluated the estimated remaining useful lives of intangible assets to determine whether events or changes in circumstances warrant a revision to the remaining period of amortization. Intangible assets are removed from the accounts when fully amortized and no longer in use.

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.

Based on intangible asset balances as of June 30, 2022, expected future amortization expense is as follows:

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