Fair Value Measurements (Tables)

3 Months Ended

Jun. 30, 2015

Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis at June 30, 2015 are as follows (amounts in thousands):

	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Balance
Assets
Cash and cash equivalents:
Money market mutual funds	$	217,606	$	—	$	—	$	217,606
Deposit accounts	—		345,941		—		345,941
Short-term investments:
Corporate bonds and debt	—		611,880		—		611,880
Government agency bonds	—		351,247		—		351,247
Municipal bonds	—		5,876		—		5,876
Long-term investments:
Corporate bonds and debt	—		399,740		6,190		405,930
Government agency bonds	—		447,760		—		447,760
Municipal bonds	—		34,509		—		34,509
Auction rate securities	—		—		9,825		9,825
Total assets measured at fair value	$	217,606	$	2,196,953	$	16,015	$	2,430,574
Liabilities
Derivative liabilities	$	—	$	6,042	$	—	$	6,042
Total liabilities measured at fair value	$	—	$	6,042	$	—	$	6,042

Assets measured at fair value on a recurring basis at March 31, 2015 are as follows (amounts in thousands):

	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Balance
Assets
Cash and cash equivalents:
Money market mutual funds	$	279,833	$	—	$	—	$	279,833
Deposit accounts	—		327,982		—		327,982
Short-term investments:
Marketable equity securities	13,166		—		—		13,166
Corporate bonds and debt	—		756,664		—		756,664
Time deposits (1)	—		506		—		506
Government agency bonds	—		549,737		—		549,737
Municipal bonds	—		30,981		—		30,981
Long-term investments:
Corporate bonds and debt	—		164,075		6,190		170,265
Government agency bonds	—		192,519		—		192,519
Municipal bonds	—		10,717		—		10,717
Auction rate securities	—		—		9,825		9,825
Derivative assets	—		8,928		—		8,928
Total assets measured at fair value	$	292,999	$	2,042,109	$	16,015	$	2,351,123