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Other Income (Expense), Net (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Other Income and Expenses [Abstract]        
Interest income $ 6,995 $ 6,394 $ 33,923 $ 15,474
Interest expense (12,348) (12,285) (48,165) (26,111)
Other 31,970 2,149 38,624 6,170
Other income (expense), net $ 26,617 $ (3,742) $ 24,382 $ (4,467)