SHORT-TERM INVESTMENTS (Tables)

12 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of short-term investments

Our short-term investments consisted of the following as of March 31, 2018:

	March 31, 2018
	Cost or Amortized Cost		Gross Unrealized
			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

	March 31, 2017
	Cost or Amortized Cost		Gross Unrealized
			Gains		Losses			Fair Value
Short-term investments
Bank time deposits	$	175,745	$	—	$	—		$	175,745
Available-for-sale securities:
Corporate bonds	243,140		98		(219		)	243,019
Commercial paper	25,938		5		(7		)	25,936
Mutual funds	4,118		123		(9		)	4,232
Total short-term investments	$	448,941	$	226	$	(235	)	$	448,932

Summary of the contracted maturities of short-term investments

The following table summarizes the contracted maturities of our short-term investments at March 31, 2018:

	March 31, 2018
	Amortized Cost		Fair Value
Short-term investments
Due in 1 year or less	$	509,981	$	508,853
Due in 1-2 years	107,337		106,553
Total short-term investments	$	617,318	$	615,406