Convertible Senior Notes (Tables)

12 Months Ended

Jul. 31, 2020

Debt Disclosure [Abstract]

Schedule of convertible debt

The net carrying value of the liability component, unamortized debt discount and unamortized debt issuance costs of the Convertible Senior Notes was as follows (in thousands):

	July 31, 2020		July 31, 2019
Principal	$	400,000	$	400,000
Less unamortized:
Debt discount	62,508		74,213
Debt issuance costs	7,284		8,465
Net carrying amount	$	330,208	$	317,322

The effective interest rate of the liability is 5.53%. The following table sets forth the interest expense recognized related to the Convertible Senior Notes (in thousands):

	Fiscal years ended July 31,
	2020		2019		2018
Contractual interest expense	$	5,000	$	5,000	$	1,903
Amortization of debt discount	11,705		11,131		4,134
Amortization of debt issuance costs	1,181		1,063		378
Total	$	17,886	$	17,194	$	6,415