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Marketable Securities (Notes) | 12 Months Ended
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Sep. 28, 2018
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | 4. MARKETABLE SECURITIES The Company's portfolio of available-for-sale marketable securities consists of the following (in millions):
| Current |  | Noncurrent
Available for sale: | September 28, 2018 |  | September 29, 2017 |  | September 28, 2018 |  | September 29, 2017
U.S. Treasury and government | $ | 65.0 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Corporate bonds and notes | 204.1 |  |  | — |  |  | 12.0 |  |  | — |
Municipal bonds | 2.0 |  |  | — |  |  | 0.8 |  |  | — |
Other government | 23.0 |  |  | — |  |  | 10.0 |  |  | — |
Total | $ | 294.1 |  |  | $ | — |  |  | $ | 22.8 |  |  | $ | — |
The contractual maturities of noncurrent available-for-sale marketable securities were due within two years or less. The Company recorded unrealized gains and losses on sales of available-for-sale marketable securities as follows (in millions):
September 28, 2018 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
U.S. Treasury and government | $ | 65.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 65.0 |
Corporate bonds and notes | 216.1 |  |  | — |  |  | (0.1 | ) |  | 216.0 |
Municipal bonds | 2.8 |  |  | — |  |  | — |  |  | 2.8 |
Other government | 33.1 |  |  | — |  |  | — |  |  | 33.1 |
Total | $ | 317.0 |  |  | $ | — |  |  | $ | (0.1 | ) |  | $ | 316.9 |
The Company concluded that the unrealized losses were temporary at September 28, 2018. Further, for bonds and other debt securities held by the Company with unrealized losses, the Company did not have the intent to sell, nor was it more likely than not that the Company would be required to sell, such securities before recovery or maturity.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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