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Other Income (Expense), Net (Detail) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Other Income and Expenses [Abstract]    
Interest income $ 12,236 $ 4,029
Interest expense (18,302) (6,986)
Other income (expense) 2,218 1,294
Other income (expense), net $ (3,848) $ (1,663)