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Fair Value (Tables) | 12 Months Ended
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Sep. 29, 2017
Fair Value Disclosures [Abstract] |
Fair Value, Assets Measured on Recurring Basis | Assets and liabilities recorded at fair value on a recurring basis consisted of the following (in millions):
| As of September 29, 2017 |  | As of September 30, 2016
|  |  | Fair Value Measurements |  |  |  | Fair Value Measurements
| Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 592.6 |  |  | $ | 592.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 408.7 |  |  | $ | 408.7 |  |  | $ | — |  |  | $ | — |
Auction rate security | — |  |  | — |  |  | — |  |  | — |  |  | 2.3 |  |  | — |  |  | — |  |  | 2.3 |
Total | $ | 592.6 |  |  | $ | 592.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 411.0 |  |  | $ | 408.7 |  |  | $ | — |  |  | $ | 2.3 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liability recorded for business combinations | 11.9 |  |  | — |  |  | — |  |  | 11.9 |  |  | 7.9 |  |  | — |  |  | — |  |  | 7.9 |
Total | $ | 11.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 11.9 |  |  | $ | 7.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 7.9 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | The following table summarizes changes to the fair value of the Level 3 assets (in millions):
| Auction rate security
Balance as of September 30, 2016 | $ | 2.3 |
Decreases in Level 3 assets | (2.3 | )
Balance as of September 29, 2017 | $ | — |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation | The following table summarizes changes to the fair value of the Level 3 liabilities (in millions):
| Contingent consideration
Balance as of September 30, 2016 | $ | 7.9 |
Increases to Level 3 liabilities | 10.7 |
Changes in fair value included in earnings | (1.3 | )
Decreases of Level 3 liabilities | (5.4 | )
Balance as of September 29, 2017 | $ | 11.9 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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