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Other Income (Expense), Net (Detail) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Other Income and Expenses [Abstract]    
Interest income $ 10,350 $ 12,236
Interest expense (11,601) (18,302)
Other 8,392 2,218
Other income (expense), net $ 7,141 $ (3,848)