0.5% Convertible Senior Notes and Capped Call (Tables)

6 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Summary of Convertible Debt

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

	September 30, 2018			March 31, 2018
Principal	$	500,250		$	—
Unamortized debt discount	(95,741		)	—
Unamortized issuance costs	(8,685		)	—
Net carrying amount	$	395,824		$	—

Summary of Interest Expense

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

	Three Months Ended September 30,			Six Months Ended September 30,
	2018		2017	2018		2017
Amortization of debt discount	$	4,593	—	$	6,767	—
Amortization of issuance costs	357		—	524		—
Contractual interest expense	625		—	924		—
Total interest expense	$	5,575	—	$	8,215	—