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Other Income (Expense), Net (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Other Income and Expenses [Abstract]        
Interest income $ 11,239 $ 14,692 $ 21,589 $ 26,928
Interest expense (14,473) (17,515) (26,074) (35,817)
Other 3,128 4,436 11,520 6,654
Other income (expense), net $ (106) $ 1,613 $ 7,035 $ (2,235)