Components of Income Tax Provision (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Current
Federal	$ 27,983	$ 19,206	$ 24,705
State and city	4,748	4,449	5,368
Foreign	3,986	2,396	25
Current Income Tax Expense (Benefit), Total	36,717	26,051	30,098
Deferred
Federal	(1,168)	3,821	4,884
State and city	(132)	(252)	1,241
Foreign	19
Total Deferred Income Tax Expense (Benefit), Total	(1,281)	3,569	6,125
Income tax expense	35,436	29,620	36,223
Income (loss) before income taxes
United States	80,145	64,940	92,933
Non-United States	11,860	14,300	(28)
Income before income taxes	$ 92,005	$ 79,240	$ 92,905