Convertible Senior Notes (Tables)

9 Months Ended

Apr. 30, 2020

Debt Disclosure [Abstract]

Schedule of convertible debt

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

	April 30, 2020		July 31, 2019
Principal	$	400,000	$	400,000
Less unamortized:
Debt discount	65,489		74,213
Debt issuance cost	7,591		8,465
Net carrying amount	$	326,920	$	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):

	Three Months Ended April 30,				Nine Months Ended April 30,
	2020		2019		2020		2019
Contractual interest expense	$	1,250	$	1,250	$	3,750	$	3,750
Amortization of debt discount	2,945		2,801		8,724		8,296
Amortization of debt issuance costs	299		269		874		787
Total	$	4,494	$	4,320	$	13,348	$	12,833