MARKETABLE SECURITIES

12 Months Ended

Jun. 30, 2021

Investments, Debt and Equity Securities [Abstract]

The amortized cost and fair value of marketable securities as of the dates indicated below were as follows:


As of June 30, 2021 (In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Corporate debt securities	$	468,192	$	689	$	(135)	$	468,746
Money market funds and other	691,375		—		—		691,375
Municipal securities	70,155		106		(33)		70,228
Sovereign securities	3,045		7		—		3,052
U.S. Government agency securities	145,810		160		(49)		145,921
U.S. Treasury securities	233,052		129		(117)		233,064
Equity securities(1)	3,211		26,719		—		29,930

Subtotal	1,614,840		27,810		(334)		1,642,316
Add: Time deposits(2)	210,636		—		—		210,636
Less: Cash equivalents	793,040		—		—		793,040
Marketable securities	$	1,032,436	$	27,810	$	(334)	$	1,059,912

As of June 30, 2020 (In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Corporate debt securities	$	379,334	$	2,673	$	(50)	$	381,957
Money market funds and other	694,950		—		—		694,950
Municipal securities	28,859		251		—		29,110
Sovereign securities	2,009		8		—		2,017
U.S. Government agency securities	106,091		252		(7)		106,336
U.S. Treasury securities	179,631		1,564		(2)		181,193


Subtotal	1,390,874		4,748		(59)		1,395,563
Add: Time deposits(2)	124,153		—		—		124,153
Less: Cash equivalents	773,653		—		—		773,653
Marketable securities	$	741,374	$	4,748	$	(59)	$	746,063

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(1)Unrealized gains on equity securities included in our portfolio consist of the initial fair value adjustment recorded upon a security becoming marketable.

(2)Time deposits excluded from fair value measurements.

Our investment portfolio includes both corporate and government securities that have a maximum maturity of three years. The longer the duration of these securities, the more susceptible they are to changes in market interest rates and bond yields. As yields increase, those securities with a lower yield-at-cost show a mark-to-market unrealized loss. Most of our unrealized losses are due to changes in market interest rates, and bond yields. We believe that we have the ability to realize the full value of all of these investments upon maturity. As of June 30, 2021, we had 208 investments in an unrealized loss position. The following table summarizes the fair value and gross unrealized losses of our investments that were in an unrealized loss position as of the date indicated below, none of which were in a continuous loss position for 12 months or more:


As of June 30, 2021 (In thousands)	Fair Value		Gross Unrealized Losses
Corporate debt securities	$	161,012	$	(135)
Municipal securities	21,605		(33)

U.S. Government agency securities	38,904		(49)
U.S. Treasury securities	117,761		(117)
Total	$	339,282	$	(334)

The contractual maturities of securities classified as available-for-sale, regardless of their classification on our Consolidated Balance Sheets, as of the date indicated below were as follows:


As of June 30, 2021 (In thousands)	Amortized Cost		Fair Value
Due within one year	$	519,815	$	547,291
Due after one year through three years	512,621		512,621
	$	1,032,436	$	1,059,912

Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Realized gains on available for sale securities were immaterial for the fiscal years ended June 30, 2021, 2020 and 2019. Realized losses on available for sale securities were $1.4 million for the fiscal year ended June 30, 2019 and were immaterial for the fiscal years ended June 30, 2021 and June 30, 2020.