Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 31, 2015	Jul. 31, 2015	Aug. 01, 2014
Difference between the provision for income taxes and income taxes at the statutory federal income tax rate, tax rate reconciliation
Effective income tax rate (as a percent)		(71.10%)	39.20%
DEFERRED TAX ASSETS
Increase in provision for income tax	$ 31,800	$ 31,785