Fair Value Measurements (Tables)

6 Months Ended

Sep. 30, 2014

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

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

Assets measured at fair value on a recurring basis at September 30, 2014 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
Money market mutual funds	$	95,464	$	—	$	—	$	95,464
Corporate bonds and debt	—		899,403		6,190		905,593
Time deposits (1)	—		20,160		—		20,160
Government agency bonds	—		666,208		—		666,208
Deposit accounts	—		385,975		—		385,975
Municipal bonds	—		41,161		—		41,161
Auction rate securities	—		—		9,825		9,825
Total assets measured at fair value	$	95,464	$	2,012,907	$	16,015	$	2,124,386

(1) Time deposits in various financial institutions with maturities greater than three months that will mature within one year.

Assets measured at fair value on a recurring basis at March 31, 2014 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
Money market mutual funds	$	192,159	$	—	$	—	$	192,159
Corporate bonds and debt	—		937,776		6,190		943,966
Government agency bonds	—		681,394		—		681,394
Deposit accounts	—		274,444		—		274,444
Municipal bonds	—		41,709		—		41,709
Auction rate securities	—		—		9,825		9,825
Total assets measured at fair value	$	192,159	$	1,935,323	$	16,015	$	2,143,497

Reconciliation of assets and liabilities measured at fair value on a recurring basis

The following tables present a reconciliation for all assets and liabilities measured at fair value on a recurring basis, excluding accrued interest components, using significant unobservable inputs (Level 3) for the year ended March 31, 2014 (amounts in thousands):

Year ended March 31, 2014	Auction Rate Securities			Corporate Debt		Contingent Consideration			Total Gains (Losses)
Balance at March 31, 2013	$	33,791		$	6,190	$	(19,100	)	$	—
Total gains (losses) (realized and unrealized):
Included in earnings	1,101			—		(1,370		)	(269		)
Included in other comprehensive income	(332		)	—		—			(332		)
Purchases, sales, issuances, and settlements, net	(24,735		)	—		20,470			—
Balance at March 31, 2014	$	9,825		$	6,190	$	—		$	(601	)

Fair Value, by Balance Sheet Grouping

Assets measured at fair value on a recurring basis are presented/classified on the condensed consolidated balance sheets at September 30, 2014 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	$	95,464	$	385,975	$	—	$	481,439
Short-term investments	—		801,670		—		801,670
Long-term investments	—		825,262		16,015		841,277
Total assets measured at fair value	$	95,464	$	2,012,907	$	16,015	$	2,124,386

Assets measured at fair value on a recurring basis are presented/classified in the condensed consolidated balance sheets at March 31, 2014 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	$	192,159	$	274,444	$	—	$	466,603
Short-term investments	—		878,182		—		878,182
Long-term investments	—		782,697		16,015		798,712
Total assets measured at fair value	$	192,159	$	1,935,323	$	16,015	$	2,143,497