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GOODWILL AND INTANGIBLE ASSETS
 9 Months Ended
Jun. 28, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND INTANGIBLE ASSETS GOODWILL AND INTANGIBLE ASSETS
The following table reflects the activity of goodwill by reportable operating segment: 
(In millions)
Oncology Systems
 
Proton Solutions
 
Other
 
Total
Balance at September 28, 2018
$
242.1

 
$
51.5

 
$
—

 
$
293.6

Business combinations
204.2

 
—

 
122.7

 
326.9

Impairment charges


 
(50.5
)
 
—

 
(50.5
)
Measurement period adjustments to business combinations in prior year
(2.1
)
 
—

 
—

 
(2.1
)
Foreign currency translation adjustments
—

 
(1.0
)
 
—

 
(1.0
)
Balance at June 28, 2019
$
444.2

 
$
—

 
$
122.7

 
$
566.9


See Note 2, "Business Combinations," for more information on the business combinations and measurement period adjustments to business combination in prior year.

During the third quarter of fiscal year 2019, the Company recorded a goodwill impairment charge of $50.5 million for the full value of the Proton Solutions reporting unit goodwill. The impairment resulted from a downward revision of the forecasted future cash flows. Factors in the third quarter that contributed to the revised forecast include observed continued weakness in proton therapy markets and lower than expected results as compared to prior forecasts. These events decreased the forecasted cash flows and the fair value of the Proton Solutions reporting unit below its carrying value as of the third quarter of fiscal year 2019.

To determine the fair value of the Proton Solutions reporting unit, the Company used the income approach. Under the income approach, the fair value of the Proton Solutions reporting unit was based on the present value of the estimated future cash flows that the reporting unit is expected to generate over its remaining life. Cash flow projections were based on management's estimates of revenue growth rates and operating margins, taking into consideration industry and market conditions. The discount rate used was based on the weighted-average cost of capital appropriate for the Proton Solutions reporting unit.
The Company also assessed whether the carrying amounts of the Proton Solutions reporting unit’s long-lived assets may not be recoverable and therefore impaired. To assess the recoverability of the reporting unit’s long-lived assets, the undiscounted cash flows of the reporting unit were analyzed and compared to the carrying value. The sum of the undiscounted cash flows exceeded the carrying value of the asset group, therefore, no impairment was indicated.
The following table reflects the gross carrying amount and accumulated amortization of the Company's intangible assets: 
 
June 28, 2019
 
September 28, 2018
(In millions)
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Technologies, patents, and trade names
$
240.4

 
$
(81.4
)
 
$
159.0

 
$
139.6

 
$
(73.9
)
 
$
65.7

Customer contracts, supplier relationships, and partner relationships
118.3

 
(23.5
)
 
94.8

 
44.9

 
(19.1
)
 
25.8

Other
6.1

 
(6.0
)
 
0.1

 
6.6

 
(5.8
)
 
0.8

Total intangible with finite lives
364.8

 
(110.9
)
 
253.9

 
191.1

 
(98.8
)
 
92.3

In-process research and development with indefinite lives
19.2

 
—

 
19.2

 
8.8

 
—

 
8.8

Total intangible assets
$
384.0

 
$
(110.9
)
 
$
273.1

 
$
199.9

 
$
(98.8
)
 
$
101.1


See Note 2, "Business Combinations," for more information about finite-lived intangible assets acquired in our business combinations.
Amortization expense for intangible assets was $6.0 million and $4.8 million during the three months ended June 28, 2019 and June 29, 2018, respectively, and $17.4 million and $15.2 million during the nine months ended June 28, 2019 and June 29, 2018, respectively.
As of June 28, 2019, the Company estimates its remaining amortization expense for intangible assets with finite lives will be as follows (in millions):
Fiscal Years:
Remaining Amortization Expense
Remainder of 2019
$
9.6

2020
35.7

2021
31.9

2022
30.2

2023
28.4

Thereafter
118.1

Total remaining amortization for intangible assets
$
253.9