SHORT-TERM INVESTMENTS

3 Months Ended

Jun. 30, 2018

Investments, Debt and Equity Securities [Abstract]

SHORT-TERM INVESTMENTS

SHORT-TERM INVESTMENTS

Our short-term investments consisted of the following:

	June 30, 2018
			Gross Unrealized
	Cost or Amortized Cost		Gains		Losses			Fair Value
Short-term investments
Bank time deposits	$	246,503	$	—	$	—		$	246,503
Available-for-sale securities:
Corporate bonds	321,860		28		(1,245		)	320,643
US Treasuries	60,044		—		(245		)	59,799
Commercial paper	5,990		—		—			5,990
Mutual funds	4,558		7		(44		)	4,521
Total short-term investments	$	638,955	$	35	$	(1,534	)	$	637,456

	March 31, 2018
			Gross Unrealized
	Cost or Amortized Cost		Gains		Losses			Fair Value
Short-term investments
Bank time deposits	$	216,663	$	—	$	—		$	216,663
Available-for-sale securities:
Corporate bonds	310,387		16		(1,687		)	308,716
US Treasuries	59,970		—		(245		)	59,725
Commercial paper	25,422		—		—			25,422
Mutual funds	4,876		16		(12		)	4,880
Total short-term investments	$	617,318	$	32	$	(1,944	)	$	615,406

Based on our review of investments with unrealized losses, we did not consider these investments to be other-than-temporarily impaired as of June 30, 2018 or March 31, 2018. We do not intend to sell any of our investments with unrealized losses, nor is it more likely than not that we will be required to sell those investments.

The following table summarizes the contracted maturities of our short-term investments at June 30, 2018:

	June 30, 2018
	Amortized Cost		Fair Value
Short-term investments
Due in 1 year or less	$	555,536	$	554,449
Due in 1 - 2 years	83,419		83,007
Total short-term investments	$	638,955	$	637,456