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Fair Value of Financial Instruments | 12 Months Ended
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Dec. 28, 2019
Fair Value of Financial Instruments |
Fair Value of Financial Instruments | 4. Fair Value of Financial Instruments The following summarizes the valuation of the Company’s financial instruments (in thousands). The tables do not include either cash on hand or assets and liabilities that are measured at historical cost or any basis other than fair value.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements | ​ | ​ | ​
​ | ​ | at December 28, 2019 Using | ​ | ​ | ​
​ | ​ | Quoted Prices in | ​ | Significant Other | ​ | Significant | ​ | ​ | ​
​ | ​ | Active Markets for | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
Description | ​ | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
Assets: |  | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 92,379 | ​ | $ | — | ​ | $ | — | ​ | $ | 92,379
Corporate debt securities | ​ | ​ | — | ​ | ​ | 1,325 | ​ | ​ | — | ​ | ​ | 1,325
Total cash equivalents | ​ | $ | 92,379 | ​ | $ | 1,325 | ​ | $ | — | ​ | $ | 93,704
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government debt securities | ​ | $ | 85,189 | ​ | $ | 86,682 | ​ | $ | — | ​ | $ | 171,871
Corporate debt securities | ​ | ​ | — | ​ | ​ | 326,954 | ​ | ​ | — | ​ | ​ | 326,954
Total short-term investments | ​ | $ | 85,189 | ​ | $ | 413,636 | ​ | $ | — | ​ | $ | 498,825
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other assets, net: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Auction rate securities | ​ | $ | — | ​ | $ | — | ​ | $ | 5,647 | ​ | $ | 5,647
Total | ​ | $ | — | ​ | $ | — | ​ | $ | 5,647 | ​ | $ | 5,647
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | $ | 177,568 | ​ | $ | 414,961 | ​ | $ | 5,647 | ​ | $ | 598,176
​ ​ 4. Fair Value of Financial Instruments (Continued) ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements | ​ | ​ | ​
​ | ​ | at December 29, 2018 Using | ​ | ​ | ​
​ | ​ | Quoted Prices in | ​ | Significant Other | ​ | Significant | ​ | ​ | ​
​ | ​ | Active Markets for | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
Description |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
Assets: | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 74,990 | ​ | $ | — | ​ | $ | — | ​ | $ | 74,990
Corporate debt securities | ​ | ​ | — | ​ |  | 18,820 | ​ |  | — | ​ |  | 18,820
Government debt securities | ​ | ​ | 9,338 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 9,338
Total cash equivalents | ​ | $ | 84,328 | ​ | $ | 18,820 | ​ | $ | — | ​ | $ | 103,148
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government debt securities | ​ | $ | 48,141 | ​ | $ | 99,211 | ​ | $ | — | ​ | $ | 147,352
Corporate debt securities | ​ | ​ | — | ​ | ​ | 269,427 | ​ | ​ | — | ​ | ​ | 269,427
Total short-term investments | ​ | $ | 48,141 | ​ | $ | 368,638 | ​ | $ | — | ​ | $ | 416,779
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other assets, net: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Auction rate securities | ​ | $ | — | ​ | $ | — | ​ | $ | 5,759 | ​ | $ | 5,759
Total | ​ | $ | — | ​ | $ | — | ​ | $ | 5,759 | ​ | $ | 5,759
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | $ | 132,469 | ​ | $ | 387,458 | ​ | $ | 5,759 | ​ | $ | 525,686
​ Valuation methodology The Company’s cash equivalents and short-term investments that are classified as Level 2 are valued using non-binding market consensus prices that are corroborated with observable market data; quoted market prices for similar instruments in active markets; or pricing models, such as a discounted cash flow model, with all significant inputs derived from or corroborated with observable market data. Investments classified as Level 3 are valued using a discounted cash flow model. The assumptions used in preparing the discounted cash flow model include estimates for interest rates, amount of cash flows, expected holding periods of the securities and a discount to reflect the Company’s inability to liquidate the securities. The Company’s derivative instruments are valued using discounted cash flow models. The assumptions used in preparing the valuation models include foreign exchange rates, forward and spot prices for currencies, and market observable data of similar instruments. Available-for-sale investments The Company's investments are reported at fair value, with unrealized gains and losses, net of tax, recorded as a component of accumulated other comprehensive income (loss) in the Consolidated Balance Sheet. The following summarizes the contractual underlying maturities of the Company’s available-for-sale investments at December 28, 2019 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Fair
​ | ​ | Cost | ​ | Value
Due in one year or less | ​ | $ | 381,583 | ​ | $ | 382,259
Due after one year through ten years | ​ |  | 196,702 | ​ | ​ | 197,370
Due after ten years | ​ |  | 18,900 | ​ |  | 18,547
​ | ​ | $ | 597,185 | ​ | $ | 598,176
​ ​ 4. Fair Value of Financial Instruments (Continued) The available-for-sale investments that were in a continuous unrealized loss position, aggregated by length of time that individual securities have been in a continuous loss position, were as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or Greater | ​ | Total
​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | ​ | Gross
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
As of December 28, 2019 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
Government debt securities | ​ | $ | 11,947 | ​ | $ | (19) | ​ | $ | 7,183 | ​ | $ | (7) | ​ | $ | 19,130 | ​ | $ | (26)
Corporate debt securities | ​ |  | 68,116 | ​ |  | (81) | ​ |  | 20 | ​ |  | — | ​ |  | 68,136 | ​ |  | (81)
Auction rate securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,647 | ​ | ​ | (353) | ​ | ​ | 5,647 | ​ | ​ | (353)
​ | ​ | $ | 80,063 | ​ | $ | (100) | ​ | $ | 12,850 | ​ | $ | (360) | ​ | $ | 92,913 | ​ | $ | (460)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or Greater | ​ | Total
​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | ​ | Gross
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
As of December 29, 2018 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
Government debt securities | ​ | $ | 13,278 | ​ | $ | (10) | ​ | $ | 88,696 | ​ | $ | (583) | ​ | $ | 101,974 | ​ | $ | (593)
Corporate debt securities | ​ |  | 112,699 | ​ | ​ | (273) | ​ | ​ | 76,310 | ​ | ​ | (448) | ​ | ​ | 189,009 | ​ | ​ | (721)
Auction rate securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,759 | ​ | ​ | (241) | ​ | ​ | 5,759 | ​ | ​ | (241)
​ | ​ | $ | 125,977 | ​ | $ | (283) | ​ | $ | 170,765 | ​ | $ | (1,272) | ​ | $ | 296,742 | ​ | $ | (1,555)
​ The gross unrealized losses as of December 28, 2019 and December 29, 2018 were due primarily to changes in market interest rates and the illiquidity of the Company’s auction-rate securities. The Company’s auction-rate securities have been illiquid since 2008 when auctions for the securities failed because sell orders exceeded buy orders. These securities have a contractual maturity date of 2046. The Company is unable to predict if these funds will become available before their maturity date. ​ The Company considers the declines in market value of its marketable securities investment portfolio to be temporary in nature. When evaluating an investment for other-than-temporary impairment, the Company reviews factors such as the severity and duration of the impairment, changes in underlying credit ratings, forecasted recovery, the Company’s intent to sell or the likelihood that it would be required to sell the investment before its anticipated recovery in market value and the probability that the scheduled cash payments will continue to be made. As of December 28, 2019, the Company has determined that no other-than-temporary impairment losses existed. At December 28, 2019 and December 29, 2018, there were no material unrealized gains associated with the Company's available-for-sale investments. Level 3 fair value measurements The following summarizes quantitative information about Level 3 fair value measurements. Auction rate securities
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair Value at | ​ | ​ | ​ | ​ | ​ | ​ |
December 28, 2019 | ​ | ​ | ​ | ​ | ​ | Weighted |
(000s) |  | Valuation Technique |  | Unobservable Input |  | Average |
$ | 5,647 |  | Discounted cash flow |  | Estimated yield |  | 3.49 | %
​ | ​ | ​ | ​ |  | Expected holding period | ​ | 10 years | ​
​ | ​ | ​ | ​ |  | Estimated discount rate |  | 3.03 | %
​ ​ 4. Fair Value of Financial Instruments (Continued) The Company has followed an established internal control procedure used in valuing auction rate securities. The procedure involves the analysis of valuation techniques and evaluation of unobservable inputs commonly used by market participants to price similar instruments, and which have been demonstrated to provide reasonable estimates of prices obtained in actual market transactions. Outputs from the valuation process are assessed against various market sources when they are available, including marketplace quotes, recent trades of similar illiquid securities, benchmark indices and independent pricing services. The technique and unobservable input parameters may be recalibrated periodically to achieve an appropriate estimation of the fair value of the securities. Significant changes in any of the unobservable inputs used in the fair value measurement of auction rate securities in isolation could result in a significantly lower or higher fair value measurement. An increase in expected yield would result in a higher fair value measurement, whereas an increase in expected holding period or estimated discount rate would result in a lower fair value measurement. Generally, a change in the assumptions used for expected holding period is accompanied by a directionally similar change in the assumptions used for estimated yield and discount rate. The following summarizes the activity in Level 3 financial instruments for the years ended December 28, 2019 and December 29, 2018 (in thousands): Assets
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended
​ | ​ | December 28, | ​ | December 29,
Auction Rate Securities |  | 2019 |  | 2018
Beginning balance | ​ | $ | 5,759 | ​ | $ | 5,681
Gain (loss) included in other comprehensive income (loss) | ​ |  | (112) | ​ |  | 78
Ending balance | ​ | $ | 5,647 | ​ | $ | 5,759
​ Fair values of other financial instruments The Company’s debt is recorded at cost, but is measured at fair value for disclosure purposes. The fair value of the Company’s convertible senior notes is determined using observable market prices. The notes are traded in less active markets and are therefore classified as a Level 2 fair value measurement. As of December 28, 2019 and December 29, 2018, the fair value of the convertible senior notes was $524.0 million and $419.0 million, respectively. The Company's other financial instruments, including cash, accounts receivable and accounts payable, are recorded at amounts that approximate their fair values due to their short maturities.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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