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Components of Provision for Income Tax Expense or Benefit (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Schedule Of Income Loss From Continuing Operations [Line Items]      
Current, Federal $ 84,274 $ 109,978 $ 139,848
Current, State 21,391 19,665 20,530
Current, Foreign 6,215 3,600 13,285
Current income tax expense, total 111,880 133,243 173,663
Deferred, Federal 13,985 (3,295) (15,171)
Deferred, State (1,218) 1,372 (6,225)
Deferred, Foreign 895 (298) (7,109)
Deferred income tax expense (benefit), total 13,662 (2,221) (28,505)
Income tax expense (benefit), total $ 125,542 $ 131,022 $ 145,158