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Proton Solutions Loans and Investments (Tables)
 12 Months Ended
Sep. 28, 2018
Receivables [Abstract]  
Outstanding Loan Receivable and Funding Commitments
The following table lists the Company's outstanding loans and commitments for funding development and construction of various proton therapy centers:
 
September 28, 2018
 
September 29, 2017
(In millions)
Balance
 
Commitment
 
 Balance
 
Commitment
Notes receivable and secured debt:
 
 
 
 
 
 
 
NYPC loan (1)
$
28.0

 
$
—

 
$
24.6

 
$
—

RPTC senior secured debt (2)
24.9

 
—

 
25.4

 
—

Proton International LLC loan (1)
1.7

 
—

 
3.1

 
—

MPTC loans (1)
—

 
—

 
67.4

 
—

CPTC DIP loan (1)
—

 
—

 
5.1

 
2.2

 
$
54.6

 
$
—

 
$
125.6

 
$
2.2

Available-for-sale Securities:
 
 
 
 
 
 
 
MPTC Series B-1 Bonds (2)
$
25.1

 
$
—

 
$
—

 
$
—

MPTC Series B-2 Bonds (1)
23.1

 
—

 
—

 
—

GPTC securities (3)
7.9

 
—

 
4.4

 
11.8

APTC securities (2)
6.4

 
—

 
—

 
—

Original CPTC loans (1)
—

 
—

 
47.4

 
—

DRTC securities (1)
—

 
—

 
8.3

 
—

 
$
62.5

 
$
—

 
$
60.1

 
$
11.8

 
 
 
 
 
 
 
 
CPTC Loans and Investment:
 
 
 
 
 
 
 
Short-term revolving loan (2)
$
3.7

 
$
3.5

 
$
—

 
$
—

Term loan (1)
44.0

 
—

 
—

 
—

Equity investment in CPTC (1)
2.2

 
—

 
—

 
—

 
$
49.9

 
$
3.5

 
$
—

 
$
—

(1) 
Included in other assets on the Company's Consolidated Balance Sheets.
(2) 
Included in prepaid and other current assets on the Company's Consolidated Balance Sheets.
(3) 
Included in prepaid and other current assets at September 28, 2018, and other assets at September 29, 2017, on the Company's Consolidated Balance Sheets.