Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016
Numerator (in thousands):
Net loss attributable to Christopher & Banks Corporation	$ (7,889)	$ (3,884)	$ (11,577)	$ (4,052)
Denominator (in thousands):
Weighted average common shares outstanding - basic	37,156	36,981	37,123	36,953
Dilutive shares	0	0	0	0
Weighted average common and common equivalent shares outstanding - diluted	37,156	36,981	37,123	36,953
Net loss per common share:
Basic (in dollars per share)	$ (0.21)	$ (0.11)	$ (0.31)	$ (0.11)
Diluted (in dollars per share)	$ (0.21)	$ (0.11)	$ (0.31)	$ (0.11)
Stock options excluded from the shares used in the computation of diluted earnings per share because they were anti-dilutive (in shares)	4,100	2,200	4,100	2,400