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Components of Income Tax Provision (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Current      
Federal $ 36,828 $ 27,983 $ 19,206
State and city 5,396 4,748 4,449
Foreign 7,040 3,986 2,396
Current Income Tax Expense (Benefit), Total 49,264 36,717 26,051
Deferred      
Federal (3,328) (1,168) 3,821
State and city 189 (132) (252)
Foreign (299) 19   
Total Deferred Income Tax Expense (Benefit), Total (3,438) (1,281) 3,569
Income tax expense 45,826 35,436 29,620
Income before income taxes      
United States 104,435 80,145 64,940
Non-United States 17,793 11,860 14,300
Income before income taxes $ 122,228 $ 92,005 $ 79,240