SHORT-TERM INVESTMENTS

6 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

SHORT-TERM INVESTMENTS

SHORT-TERM INVESTMENTS

Our Short-term investments consisted of the following:

	September 30, 2018
			Gross Unrealized
	Cost or Amortized Cost		Gains		Losses			Fair Value
Short-term investments
Bank time deposits	$	183,059	$	—	$	—		$	183,059
Available-for-sale securities:
Corporate bonds	317,795		36		(782		)	317,049
US Treasuries	53,516		—		(211		)	53,305
Commercial paper	9,539		—		—			9,539
Total Short-term investments	$	563,909	$	36	$	(993	)	$	562,952

	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 September 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 September 30, 2018:

	September 30, 2018
	Amortized Cost		Fair Value
Short-term investments
Due in 1 year or less	$	488,070	$	487,300
Due in 1 - 2 years	75,839		75,652
Total short-term investments	$	563,909	$	562,952