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GOODWILL AND INTANGIBLE ASSETS (Tables)
 6 Months Ended
Mar. 29, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Activity of Goodwill by Reportable Operating Segment The following table reflects the activity of goodwill by reportable operating segment: 
(In millions)
Oncology
Systems
 
Proton Solutions
 
Total
Balance at September 28, 2018
$
242.1

 
$
51.5

 
$
293.6

Business combination
22.0

 
—

 
22.0

Measurement period adjustment to a business combination in prior year
(4.7
)
 
—

 
(4.7
)
Foreign currency translation adjustments
—

 
(1.6
)
 
(1.6
)
Balance at March 29, 2019
$
259.4

 
$
49.9

 
$
309.3
Schedule of Indefinite-Lived Intangible Assets The following table reflects the gross carrying amount and accumulated amortization of the Company's intangible assets: 
 
March 29, 2019
 
September 28, 2018
(In millions)
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Technologies and patents
$
136.2

 
$
(76.8
)
 
$
59.4

 
$
139.6

 
$
(73.9
)
 
$
65.7

Customer contracts and supplier relationship
44.4

 
(22.0
)
 
22.4

 
44.9

 
(19.1
)
 
25.8

Other
6.1

 
(5.9
)
 
0.2

 
6.6

 
(5.8
)
 
0.8

Total intangible with finite lives
186.7

 
(104.7
)
 
82.0

 
191.1

 
(98.8
)
 
92.3

In-process research and development with indefinite lives
8.8

 
—

 
8.8

 
8.8

 
—

 
8.8

Total intangible assets
$
195.5

 
$
(104.7
)
 
$
90.8

 
$
199.9

 
$
(98.8
)
 
$
101.1
Gross Carrying Amount and Accumulated Amortization of Intangible Assets The following table reflects the gross carrying amount and accumulated amortization of the Company's intangible assets: 
 
March 29, 2019
 
September 28, 2018
(In millions)
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Technologies and patents
$
136.2

 
$
(76.8
)
 
$
59.4

 
$
139.6

 
$
(73.9
)
 
$
65.7

Customer contracts and supplier relationship
44.4

 
(22.0
)
 
22.4

 
44.9

 
(19.1
)
 
25.8

Other
6.1

 
(5.9
)
 
0.2

 
6.6

 
(5.8
)
 
0.8

Total intangible with finite lives
186.7

 
(104.7
)
 
82.0

 
191.1

 
(98.8
)
 
92.3

In-process research and development with indefinite lives
8.8

 
—

 
8.8

 
8.8

 
—

 
8.8

Total intangible assets
$
195.5

 
$
(104.7
)
 
$
90.8

 
$
199.9

 
$
(98.8
)
 
$
101.1
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense As of March 29, 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
$
10.4

2020
18.8

2021
15.2

2022
14.1

2023
13.4

Thereafter
10.1

Total remaining amortization for intangible assets
$
82.0