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Goodwill and intangible assets
 3 Months Ended
Sep. 30, 2023
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, 2023 are as follows:
Diversified Industrial
Segment		Aerospace
Systems
Segment		Total
Balance at June 30, 2023$7,682,755 $2,945,839 $10,628,594 
Acquisition1,113 9,778 10,891 
Divestiture(10,520)— (10,520)
Foreign currency translation(83,232)(22,604)(105,836)
Balance at September 30, 2023$7,590,116 $2,933,013 $10,523,129 
Acquisition represents goodwill resulting from the purchase price allocation for the Acquisition during the measurement period. Divestiture represents goodwill associated with the sale of the business. 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, 2023June 30, 2023
 Gross Carrying
Amount		Accumulated
Amortization		Gross Carrying
Amount		Accumulated
Amortization
Patents and technology$2,104,195 $374,104 $2,128,847 $352,040 
Trade names1,036,723 399,105 1,047,678 390,737 
Customer relationships and other8,015,606 2,191,357 8,109,063 2,092,197 
Total$11,156,524 $2,964,566 $11,285,588 $2,834,974 
Total intangible amortization expense for the three months ended September 30, 2023 and 2022 was $156 million and $87 million, respectively. The estimated amortization expense for the five years ending June 30, 2024 through 2028 is $565 million, $543 million, $539 million, $533 million and $524 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, 2023 and 2022.