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Convertible Senior Notes - Interest Expense (Details) - Convertible Debt - Convertible Senior Notes Due 2023
$ in Thousands
3 Months Ended
Apr. 30, 2019
USD ($)
Debt Instrument [Line Items]  
Contractual interest expense $ 710
Amortization of debt discount 484
Amortization of transaction costs 5,970
Total $ 7,164