FAIR VALUE

We define fair value as the estimated price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining fair value measurements for assets and liabilities which are required to be recorded at fair value, we consider the principal or most advantageous market in which we would transact and the market-based risk measurements or assumptions that market participants would use in pricing the asset or liability, such as inherent risk, transfer restrictions and credit risk. We apply the following fair value hierarchy, which ranks the quality and reliability of the information used to determine fair values:


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


Level 2-	Inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices of identical assets or liabilities in markets with insufficient volume or infrequent transactions (less active markets), or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.


Level 3-	Unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of the assets or liabilities.

Our cash equivalents and short-term investment instruments are generally classified within Level 1 or Level 2 of the fair value hierarchy because they are valued using quoted market prices, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency. The types of instruments valued based on quoted market prices in active markets include most money market funds, which are generally classified within Level 1 of the fair value hierarchy. The types of instruments valued based on other observable inputs include investment-grade corporate bonds, commercial paper, U.S. Treasury and agency securities, which are generally classified within Level 2 of the fair value hierarchy.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

Assets and liabilities measured at fair value on a recurring basis are shown in the table below by their corresponding balance sheet caption and consisted of the following types of instruments at September 29, 2018 and June 30, 2018:



	Fair Value Measurement at September 29, 2018 Using
	Quoted Prices		Significant
	in Active		Other		Significant
	Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
	(Thousands)
Assets:
Cash and cash equivalents: ⁽¹⁾
Money market funds	$	273,234	$	—	$	—	$	273,234
Short-term investments:
U.S. Treasury securities	—		3,997		—		3,997
Total assets measured at fair value	$	273,234	$	3,997	$	—	$	277,231


⁽¹⁾	Excludes $64.7 million in cash held in our bank accounts at September 29, 2018.



	Fair Value Measurement at June 30, 2018 Using
	Quoted Prices		Significant
	in Active		Other		Significant
	Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
	(Thousands)
Assets:
Cash and cash equivalents: ⁽¹⁾
Money market funds	$	153,392	$	—	$	—	$	153,392
Commercial paper	—		3,999		—		3,999
Short-term investments:
Commercial paper	—		41,401		—		41,401
Corporate bonds	—		4,100		—		4,100
U.S. Treasury securities	—		31,939		—		31,939
Total assets measured at fair value	$	153,392	$	81,439	$	—	$	234,831


⁽¹⁾	Excludes $88.3 million in cash held in our bank accounts at June 30, 2018.