Document and Entity Information Document (USD $)	12 Months Ended
	Jan. 28, 2012	Mar. 21, 2012	Jul. 30, 2011
Entity Information [Line Items]
Entity Registrant Name	BANK JOS A CLOTHIERS INC /DE/
Entity Central Index Key	0000920033
Current Fiscal Year End Date	--01-28
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Jan. 28, 2012
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		27,827,837
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 1,004,700,000