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Components of Provision for Income Tax Expense or Benefit (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Income Tax Disclosure [Abstract]      
Current, Federal $ 71,520 $ 124,988 $ 103,951
Current, State 18,088 10,772 15,130
Current, Foreign 9,356 9,014 5,699
Current income tax expense, total 98,964 144,774 124,780
Deferred, Federal (6,818) 10,270 (5,765)
Deferred, State 965 (1,914) 1,029
Deferred, Foreign (5,561) (27) (65)
Deferred income tax expense (benefit), total (11,414) 8,329 (4,801)
Income tax expense (benefit), total $ 87,550 $ 153,103 $ 119,979