0.5% Convertible Senior Notes and Capped Call (Tables)

9 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Summary of Convertible Debt

The net carrying amount of the liability component of the Notes was as follows (in thousands):

	December 31, 2019		March 31, 2019
Principal	$	500,250	$	500,250
Unamortized debt discount	(71,859)		(86,374)
Unamortized issuance costs	(6,736)		(7,939)
Net carrying amount	$	421,655	$	405,937

Summary of Interest Expense

Interest expense related to the Notes was as follows (in thousands):

	Three Months Ended December 31,				Nine Months Ended December 31,
	2019		2018		2019		2018
Amortization of debt discount	$	4,901	$	4,654	$	14,515	$	11,421
Amortization of issuance costs	413		367		1,203		891
Contractual interest expense	625		625		1,876		1,549
Total interest expense	$	5,939	$	5,646	$	17,594	$	13,861