Earnings Per Share ("EPS") (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Nov. 02, 2019	Oct. 31, 2020	Nov. 02, 2019
Numerator (in thousands):
Net (loss) income attributable to Christopher & Banks Corporation	$ (10,808)	$ 487	$ (43,140)	$ (11,606)
Denominator (in thousands):
Weighted average common shares outstanding - basic (in shares)	37,855	37,495	37,728	37,755
Dilutive shares (in shares)	0	57	0	0
Weighted average common and common equivalent shares outstanding - diluted (in shares)	37,855	37,552	37,728	37,755
Net (loss) income per common share:
Basic (in dollars per share)	$ (0.29)	$ 0.01	$ (1.14)	$ (0.31)
Diluted (in dollars per share)	$ (0.29)	$ 0.01	$ (1.14)	$ (0.31)
Stock options excluded from the shares used in the computation of diluted earnings per share because they were anti-dilutive	4,200	4,400	4,200	4,600