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Components of Provision for Income Tax Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Components Of Income Tax Expense Benefit [Line Items]      
Current, Federal $ 139,848 $ 93,625 $ 93,244
Current, State 20,530 15,746 14,199
Current, Foreign 13,285 6,639 8,287
Current income tax expense, total 173,663 116,010 115,730
Deferred, Federal (15,171) 23,285 (11,292)
Deferred, State (6,225) (722) 124
Deferred, Foreign (7,109) (315) (982)
Deferred income tax expense (benefit), total (28,505) 22,248 (12,150)
Income tax expense (benefit), total $ 145,158 $ 138,258 $ 103,580