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Components of Provision for Income Tax Expense or Benefit (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Schedule Of Income Loss From Continuing Operations [Line Items]      
Current, Federal $ 103,951 $ 84,274 $ 109,978
Current, State 15,130 21,391 19,665
Current, Foreign 5,699 6,215 3,600
Current income tax expense, total 124,780 111,880 133,243
Deferred, Federal (5,765) 13,985 (3,295)
Deferred, State 1,029 (1,218) 1,372
Deferred, Foreign (65) 895 (298)
Deferred income tax expense (benefit), total (4,801) 13,662 (2,221)
Income tax expense (benefit), total $ 119,979 $ 125,542 $ 131,022