Fair Value of Financial Instruments (Tables)

3 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Financial Assets and Liabilities

The following summarizes the fair value of our financial instruments at June 30, 2018, exclusive of pension plan assets and liabilities (in thousands):

	Quoted Prices in Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total
Assets:
Cash equivalents
Money market funds	$	151,017	$	—	$	—	$	151,017
Available-for-sale securities
Corporate debt securities	$	—	$	185,199	$	—	$	185,199
Non-US government securities	—		13,556		—		13,556
Agency discount notes	—		456		—		456
	$	—	$	199,211	$	—	$	199,211

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The following summarizes the fair value of our financial instruments at March 31, 2018, exclusive of pension plan assets and liabilities (in thousands):

	Quoted Prices in Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total
Assets:
Cash equivalents
Money market funds	$	211,891	$	—	$	—	$	211,891
Available-for-sale securities
Corporate debt securities	$	—	$	183,322	$	—	$	183,322
Non-US government securities	—		14,619		—		14,619
Certificates of deposit	—		500		—		500
Agency discount notes	—		455		—		455
	$	—	$	198,896	$	—	$	198,896