SHORT-TERM INVESTMENTS (Tables)

6 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of 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

Summary of the contracted maturities of short-term 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