ASC 820 establishes a single authoritative definition of fair value, a framework for measuring fair value and expands disclosure of fair value measurements. ASC 820 requires financial assets and liabilities to be categorized based on the inputs used to calculate their fair values as follows:

Level 1 - Quoted prices in active markets for identical assets or liabilities.

Level 2 - Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly.

Level 3 - Unobservable inputs for the asset or liability, which reflect the Company’s own assumptions about the assumptions that market participants would use in pricing the asset or liability (including assumptions about risk).

The Company’s financial instruments include cash and equivalents, short term investments consisting of bank certificates of deposit, accounts receivable and payable, derivative instruments, short-term borrowings, and accrued liabilities. The carrying amount of these instruments approximates fair value because of their short-term nature.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table presents the Company’s financial assets and liabilities measured at fair value on a recurring basis based upon the level within the fair value hierarchy in which the fair value measurements fall, as of December 26, 2015 (in thousands):

The following table presents the Company’s financial assets and liabilities measured at fair value on a recurring basis based upon the level within the fair value hierarchy in which the fair value measurements fall, as of December 27, 2014 (in thousands):

The following table presents our financial assets and liabilities at fair value on a recurring basis based upon the level within the fair value hierarchy in which the fair value measurements fall, as of September 26, 2015:

The following table provides a summary of changes in fair value of our Level 3 financial instruments for the periods ended December 26, 2015 and December 27, 2014 (in thousands):

Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis

The Company measures certain non-financial assets and liabilities, including long-lived assets, goodwill and intangible assets, at fair value on a non-recurring basis. Fair value measurements of non-financial assets and non-financial liabilities are used primarily in the impairment analyses of long-lived assets, goodwill and other intangible assets. During the periods ended December 26, 2015 and December 27, 2014, the Company was not required to measure any significant non-financial assets and liabilities at fair value.

Fair Value of Other Financial Instruments

In November 2015, the Company issued $400 million aggregate principal amount of 6.125% senior notes due November 2023 (the “2023 Notes”). The estimated fair value of the Company’s 2023 Notes as of December 26, 2015 was $404.0 million, compared to a carrying value of $393.8 million.

In January 2015, the Company called $50 million aggregate principal amount of the Company’s senior subordinated notes due 2018 (the “2018 Notes”) for redemption on March 1, 2015 at a price of 102.063%. In December 2015, the Company redeemed the remaining $400 million aggregate principal amount of the 2018 Notes at a price of 102.063%. The estimated fair value of the Company’s $450 million principal amount of 2018 Notes as of December 27, 2014 was $461.9 million, compared to a carrying value of $444.9 million. The estimated fair value of the Company’s $400 million aggregate principal amount of 2018 Notes as of September 26, 2015 was $410.5 million, compared to a carrying value of $396.5 million. The estimated fair value is based on quoted market prices for these notes, which are Level 1 inputs within the fair value hierarchy.