Fair Value Measurements (Tables)

9 Months Ended

Dec. 31, 2017

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 December 31, 2017 are as follows (amounts in thousands):

	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Total Balance
Assets
Cash and cash equivalents:
Money market mutual funds	$	108,204	$	—	$	108,204
Deposit accounts	—		563,875		563,875
Short-term investments:
Marketable equity securities	2,465		—		2,465
Corporate bonds and debt	—		288,224		288,224
Government agency bonds	—		136,825		136,825
Long-term investments:
Corporate bonds and debt	—		202,143		202,143
Government agency bonds	—		673,306		673,306
Municipal bonds - taxable	—		9,943		9,943
Total assets measured at fair value	$	110,669	$	1,874,316	$	1,984,985

Assets measured at fair value on a recurring basis at March 31, 2017 are as follows (amounts in thousands):

	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Total Balance
Assets
Cash and cash equivalents:
Money market mutual funds	$	343,815	$	—	$	343,815
Deposit accounts	—		564,869		564,869
Short-term investments:
Marketable equity securities	1,586		—		1,586
Corporate bonds and debt	—		165,207		165,207
Government agency bonds	—		161,973		161,973
Municipal bonds - tax-exempt	—		55,279		55,279
Municipal bonds - taxable	—		10,043		10,043
Long-term investments:
Corporate bonds and debt	—		42,565		42,565
Government agency bonds	—		64,892		64,892
Total assets measured at fair value	$	345,401	$	1,064,828	$	1,410,229