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Components of Provision for Income Tax Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Components Of Income Tax Expense Benefit [Line Items]      
Current, Federal $ 93,625 $ 93,244 $ 127,390
Current, State 15,746 14,199 19,492
Current, Foreign 6,639 8,287 6,095
Current income tax expense, total 116,010 115,730 152,977
Deferred, Federal 23,285 (11,292) (6,698)
Deferred, State (722) 124 (1,906)
Deferred, Foreign (315) (982) (123)
Deferred income tax expense (benefit), total 22,248 (12,150) (8,727)
Income tax expense (benefit), total $ 138,258 $ 103,580 $ 144,250