Document and Entity Information	3 Months Ended
	May 03, 2014	Jun. 04, 2014
Entity Information [Line Items]
Entity Registrant Name	BANK JOS A CLOTHIERS INC /DE/
Entity Central Index Key	0000920033
Current Fiscal Year End Date	--01-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	May 03, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		28,004,839