Convertible Senior Notes and Capped Call (Tables)

6 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Summary of Convertible Debt

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

	September 30, 2019		March 31, 2019
Principal	$	500,250	$	500,250
Unamortized debt discount	(76,760)		(86,374)
Unamortized issuance costs	(7,149)		(7,939)
Net carrying amount	$	416,341	$	405,937

Summary of Interest Expense

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

	Three Months Ended September 30,				Six Months Ended September 30,
	2019		2018		2019		2018
Amortization of debt discount	$	4,838	$	4,593	$	9,614	$	6,767
Amortization of issuance costs	401		357		790		524
Contractual interest expense	626		625		1,251		924
Total interest expense	$	5,865	$	5,575	$	11,655	$	8,215