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Fair Value Measurement (Tables) | 6 Months Ended
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Oct. 27, 2018
Fair Value Disclosures [Abstract] |
Schedule of Fair Value | The following table sets forth by Level within the fair value hierarchy our financial assets and liabilities that were accounted for at fair value on a recurring basis at October 27, 2018 and April 28, 2018 according to the valuation techniques we used to determine their fair values. There have been no transfers of assets or liabilities among the fair value hierarchies presented.
| Fair Value Measurements
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Balance as of October 27, 2018 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 35,557 |  |  | $ | — |  |  | $ | — |  |  | $ | 35,557 |
Restricted cash | 26 |  |  | — |  |  | — |  |  | 26 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |
Certificates of deposit | — |  |  | 5,196 |  |  | — |  |  | 5,196 |
U.S. Government securities | 7,231 |  |  | — |  |  | — |  |  | 7,231 |
U.S. Government sponsored entities | — |  |  | 15,986 |  |  | — |  |  | 15,986 |
Municipal bonds | — |  |  | 3,308 |  |  | — |  |  | 3,308 |
Derivatives - asset position | — |  |  | 187 |  |  | — |  |  | 187 |
Derivatives - liability position | — |  |  | (7 | ) |  | — |  |  | (7 | )
Contingent liabilities | — |  |  | — |  |  | (1,338 | ) |  | (1,338 | )
| $ | 42,814 |  |  | $ | 24,670 |  |  | $ | (1,338 | ) |  | $ | 66,146 |
Balance as of April 28, 2018 |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 29,727 |  |  | $ | — |  |  | $ | — |  |  | $ | 29,727 |
Restricted cash | 28 |  |  | — |  |  | — |  |  | 28 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |
Certificates of deposit | — |  |  | 8,669 |  |  | — |  |  | 8,669 |
U.S. Government securities | 992 |  |  | — |  |  | — |  |  | 992 |
U.S. Government sponsored entities | — |  |  | 19,949 |  |  | — |  |  | 19,949 |
Municipal bonds | — |  |  | 4,912 |  |  | — |  |  | 4,912 |
Derivatives - asset position | — |  |  | 41 |  |  | — |  |  | 41 |
Derivatives - liability position | — |  |  | (236 | ) |  | — |  |  | (236 | )
Contingent liabilities | — |  |  | — |  |  | (1,000 | ) |  | (1,000 | )
| $ | 30,747 |  |  | $ | 33,335 |  |  | $ | (1,000 | ) |  | $ | 63,082 |
Rollforward of Level 3 Contingent Consideration Liabilities | A roll forward of the Level 3 contingent liabilities, both short- and long-term, for the six months ended October 27, 2018 is as follows:
Contingent liability as of April 28, 2018 |  | $ | 1,000 |
Additions |  | 1,316 |
Fair value adjustments (1) |  | (956 | )
Interest |  | (7 | )
Foreign currency translation |  | (15 | )
Contingent liabilities as of October 27, 2018 |  | $ | 1,338 |
(1) We recorded an adjustment to the contingent consideration liability in the second quarter of fiscal 2019, resulting in an increase in income from operations. The adjustment was caused by a change in the fair value of the contingent liability, which reflected future financial performance measures established by the seller prior to the close of the acquisition.

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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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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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