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Components of Provision for Income Tax Expense or Benefit (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Income Tax Disclosure [Abstract]      
Current, Federal $ 50,507 $ 71,520 $ 124,988
Current, State 13,525 18,088 10,772
Current, Foreign 6,141 9,356 9,014
Current income tax expense, total 70,173 98,964 144,774
Deferred, Federal (3,260) (6,818) 10,270
Deferred, State (772) 965 (1,914)
Deferred, Foreign 5,483 (5,561) (27)
Deferred income tax expense (benefit), total 1,451 (11,414) 8,329
Income tax expense (benefit), total $ 71,624 $ 87,550 $ 153,103