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Intangible Assets, Net
 9 Months Ended
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net Intangible Assets, Net
Intangible assets are stated at amortized cost and consist of the following:
In thousands
June 30, 2022September 30, 2021
Cost
Accumulated
Amortization
Net
Cost
Accumulated
Amortization
Net
Patents and licenses$28,556 $(8,531)$20,025 $32,982 $(9,207)$23,775 
Developed technology (a)
28,666 (2,119)26,547 12,600 (1,050)11,550 
Customer relationship/Trade names (a)
8,638 (2,669)5,969 — — — 
Other (a)
1,212 (257)955 894 (162)732 
Total
$67,072 $(13,576)$53,496 $46,476 $(10,419)$36,057 
(a) The developed technology intangible assets and customer relationship/trade names intangible assets included $16.5 million and $4.3 million, respectively, related to the business acquisition discussed in Note 4 - Business Combinations.
Intangible assets are amortized over their estimated useful lives on a straight-line basis. Total amortization expense for the three months ended June 30, 2022 and 2021 was $1.3 million and $0.9 million, respectively. Total amortization expense for the nine months ended June 30, 2022 and 2021 was $3.2 million and $2.6 million, respectively.