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Marketable Securities (Tables) | 12 Months Ended
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Sep. 28, 2018
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale Securities [Table Text Block] | 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 |  |  | $ | — |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] | 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 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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