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Balance Sheet Components (Tables)
 12 Months Ended
Sep. 28, 2018
Balance Sheet Related Disclosures [Abstract]  
Debt Securities, Available-for-sale
The following tables summarize the Company's cash equivalents and available-for-sale securities:
 
September 28, 2018
(In millions)
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Cash equivalents
 
 
 
 
 
 
 
Money market funds
$
44.1

 
$
—

 
$
—

 
$
44.1

Total money market funds
$
44.1

 
$
—

 
$
—

 
$
44.1

 
 
 
 
 
 
 
 
Available-for-sale securities
 
 
 
 
 
 
 
MPTC Series B-1 Bonds (1)
$
25.1

 
$
—

 
$
—

 
$
25.1

MPTC Series B-2 Bonds (2)
23.1

 
—

 
—

 
23.1

GPTC securities (1)
7.9

 
—

 
—

 
7.9

APTC securities (1)
6.4

 
—

 
—

 
6.4

Total available-for-sale securities
$
62.5

 
$
—

 
$
—

 
$
62.5

 
September 29, 2017
(In millions)
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Available-for-sale securities
 
 
 
 
 
 
 
Original CPTC Loans (2)
$
47.4

 
$
—

 
$
—

 
$
47.4

DRTC securities (2)
8.3

 
—

 
—

 
8.3

GPTC securities (2)
4.4

 
—

 
—

 
4.4

Total available-for-sale securities
$
60.1

 
$
—

 
$
—

 
$
60.1


(1) 
Included in prepaid and other current assets on the Company's Consolidated Balance Sheets because the Company has the ability and intent to sell this security in the next twelve months.
(2) 
Included in other assets on the Company's Consolidated Balance Sheets because the maturity dates are greater than one year, and the Company does not have the intent and ability to collect or sell all or a portion of its loans or securities in the next twelve months.
Schedule of Unbilled Receivables and Deferred Revenues from Contracts with Customers
The following table provides the Company's unbilled receivables and deferred revenues from contracts with customers:
 
 
September 28,
 
September 29,
(In millions)
 
2018
 
2017
Unbilled receivables - current
 
$
362.8

 
$
259.1

Unbilled receivables - long-term (1)
 
36.3

 
10.9

Deferred revenues - current
 
(729.7
)
 
(755.4
)
Deferred revenues - long-term (2)
 
(38.6
)
 
$
(7.2
)
Total net unbilled receivables (deferred revenues)
 
$
(369.2
)
 
$
(492.6
)
(1) 
Included in other assets on the Company's Consolidated Balance Sheets.
(2) 
Included in other long-term liabilities on the Company's Consolidated Balance Sheets.
Components of Inventories
The following table summarizes the Company's inventories:
 
 
September 28,
 
September 29,
(In millions)
 
2018
 
2017
Raw materials and parts
 
$
304.1

 
$
296.5

Work-in-process
 
50.6

 
47.7

Finished goods
 
83.4

 
73.5

Total inventories
 
$
438.1

 
$
417.7
Components of Prepaid Expenses and Other Current Assets
The following table summarizes the Company's prepaid expenses and other current assets:
 
 
September 28,
 
September 29,
(In millions)
 
2018
 
2017
Prepaid income taxes
 
$
48.1

 
$
59.9

Available-for-sale securities (1)
 
39.4

 
—

RPTC senior secured debt (1)
 
24.9

 
25.4

Prepaid compensation
 
14.2

 
11.6

Advance payments to suppliers
 
16.6

 
14.9

Other current receivables
 
24.1

 
28.7

Other prepaid expenses
 
66.0

 
49.8

Total prepaid expenses and other current assets
 
$
233.3

 
$
190.3


(1) 
See Note 16, "Proton Solutions Loans and Investment" for more information on the Company's available-for-sale securities and the Rinecker Proton Therapy Center ("RPTC").
Components of Property, Plant and Equipment
The following table summarizes the Company's property, plant and equipment, net:
 
 
September 28,
 
September 29,
(In millions)
 
2018
 
2017
Land and land improvements
 
$
44.2

 
$
44.2

Buildings and leasehold improvements
 
227.0

 
220.4

Machinery and equipment
 
404.0

 
375.9

Construction in progress
 
28.6

 
14.6

 
 
703.8

 
655.1

Accumulated depreciation and amortization
 
(429.2
)
 
(399.8
)
Total property, plant and equipment, net
 
$
274.6

 
$
255.3
Other Assets
The following table summarizes the Company's other assets:
 
 
September 28,
 
September 29,
(In millions)
 
2018
 
2017
Long-term receivables, net
 
$
115.7

 
$
114.8

Deferred Compensation Plan ("DCP") assets
 
75.2

 
72.7

Long-term available-for-sale securities
 
23.1

 
60.1

Investments in privately-held companies
 
39.4

 
27.1

Other
 
39.4

 
26.1

Total other assets
 
$
292.8

 
$
300.8
Components of Accrued Expenses
The following table summarizes the Company's accrued liabilities:
 
 
September 28,
 
September 29,
(In millions)
 
2018
 
2017
Accrued compensation and benefits
 
$
151.1

 
$
109.7

DCP liabilities
 
74.4

 
70.7

Product warranty
 
40.9

 
37.0

Income taxes payable
 
49.0

 
38.8

Other
 
104.3

 
118.7

Total accrued liabilities
 
$
419.7

 
$
374.9
Components of Other Long-Term Liabilities
The following table summarizes the Company's other long-term liabilities:
 
 
September 28,
 
September 29,
(In millions)
 
2018
 
2017
Long-term income taxes payable
 
$
189.1

 
$
48.6

Long-term deferred revenues
 
38.6

 
7.2

Deferred income taxes
 
31.4

 
17.1

Other
 
65.2

 
54.5

Total other long-term liabilities
 
$
324.3

 
$
127.4