Debt and Financing Arrangements (Tables)

6 Months Ended

Jul. 31, 2018

Debt Disclosure [Abstract]

Schedule of Interest Expense

The following table sets forth total interest expense recognized related to the 2023 Notes (in thousands):

	Three Months Ended July 31, 2018		Six Months Ended July 31, 2018
	(unaudited)
Contractual interest expense	$	216	$	362
Amortization of debt issuance costs	288		478
Amortization of debt discount	3,554		5,935
Total	$	4,058	$	6,775

Schedule of Liability and Equity Component of 2023 Notes

The 2023 Notes, net consisted of the following (in thousands):

	As of July 31, 2018
	(unaudited)
Liability component:
Principal	$	345,000
Less: unamortized debt issuance costs and debt discount	(81,238		)
Net carrying amount	$	263,762
	At Issuance
	(unaudited)
Equity component:
2023 Notes	$	79,962
Less: issuance costs	(2,320		)
Carrying amount of the equity component(1)	$	77,642

⁽¹⁾ Included in the condensed consolidated balance sheets within Additional paid-in capital.