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Goodwill and intangible assets
3 Months Ended
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and intangible assets Goodwill and intangible assets
The changes in the carrying amount of goodwill for the three months ended September 30, 2022 are as follows:
Diversified Industrial
Segment
Aerospace
Systems
Segment
Total
Balance at June 30, 2022$7,185,981 $554,101 $7,740,082 
Acquisition53,934 2,776,911 2,830,845 
Foreign currency translation(166,413)(20,384)(186,797)
Balance at September 30, 2022$7,073,502 $3,310,628 $10,384,130 
Acquisition represents goodwill resulting from the preliminary purchase price allocation for the Acquisition during the measurement period. Refer to Note 4 for further discussion.
Intangible assets are amortized using the straight-line method over their legal or estimated useful lives. The following summarizes the gross carrying value and accumulated amortization for each major category of intangible assets:
 September 30, 2022June 30, 2022
 Gross Carrying
Amount
Accumulated
Amortization
Gross Carrying
Amount
Accumulated
Amortization
Patents and technology$2,699,116 $274,128 $990,775 $259,587 
Trademarks1,203,677 340,902 727,820 339,244 
Customer lists and other6,842,011 1,741,763 3,735,042 1,718,989 
Total$10,744,804 $2,356,793 $5,453,637 $2,317,820 
Total intangible amortization expense for the three months ended September 30, 2022 and 2021 was $87 million and $80 million, respectively. The estimated amortization expense for the five years ending June 30, 2023 through 2027 is $520 million, $559 million, $551 million, $546 million and $540 million, respectively.
Intangible assets are evaluated for impairment whenever events or circumstances indicate that the undiscounted net cash flows to be generated by their use over their expected useful lives and eventual disposition may be less than their net carrying value. No material intangible asset impairments occurred during the three months ended September 30, 2022 and 2021.