0.5% Convertible Senior Notes and Capped Call (Tables)

9 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Summary of Convertible Debt

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

	December 31, 2018			March 31, 2018
Principal	$	500,250		$	—
Unamortized debt discount	(91,087		)	—
Unamortized issuance costs	(8,318		)	—
Net carrying amount	$	400,845		$	—

Summary of Interest Expense

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

	Three Months Ended December 31,			Nine Months Ended December 31,
	2018		2017	2018		2017
Amortization of debt discount	$	4,654	—	$	11,421	—
Amortization of issuance costs	367		—	891		—
Contractual interest expense	625		—	1,549		—
Total interest expense	$	5,646	—	$	13,861	—