Document and Entity Information - $ / shares
 3 Months Ended
May 04, 2019
May 30, 2019
Feb. 02, 2019
May 05, 2018
Document and Entity Information        
Entity Registrant Name Michaels Companies, Inc.      
Entity Central Index Key 0001593936      
Document Type 10-Q      
Document Period End Date May 04, 2019      
Amendment Flag false      
Current Fiscal Year End Date --02-01      
Entity Filer Category Large Accelerated Filer      
Entity Common Stock, Shares Outstanding   158,170,366    
Common Stock, par value (in dollars per share) $ 0.06775   $ 0.06775 $ 0.06775
Document Fiscal Year Focus 2019      
Document Fiscal Period Focus Q1      
Entity Small Business false      
Entity Emerging Growth Company false      
Trading Symbol MIK