Document and Entity Information Document (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Feb. 02, 2013	Mar. 27, 2013	Jul. 28, 2012
Entity Information [Line Items]
Entity Registrant Name	BANK JOS A CLOTHIERS INC /DE/
Entity Central Index Key	0000920033
Current Fiscal Year End Date	--02-02
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Feb. 02, 2013
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		27,962,249
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 874.4