Income Taxes - Income Tax (Benefit) Expense Components (Details)	12 Months Ended
	Jan. 28, 2017 USD ($) item	Jan. 30, 2016 USD ($)	Jan. 31, 2015 USD ($)	Feb. 01, 2014 USD ($)	Jan. 28, 2012 USD ($)
Income Taxes
Benefits not recognized due to uncertainty	$ 0
Work opportunity tax benefits not recognized due to uncertainty	$ 0
Number of states in which ability to utilize tax credits is no longer more likely than not | item	1
Increase in valuation allowance			$ 100,000	$ 400,000	$ 800,000
Credits carry back period	2 years
Credits carry forward period	20 years
Income tax benefit related to federal and state tax credits	$ 1,800,000	$ 1,200,000	$ 2,100,000