Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

v2.4.1.9
Summary of Significant Accounting Policies (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
0 Months Ended 12 Months Ended
Jul. 02, 2014
Jun. 06, 2014
Jan. 31, 2015
item
Feb. 01, 2014
Feb. 02, 2013
Aug. 02, 2014
Jul. 02, 2014
Summary of Significant Accounting Policies              
Number of states in which the entity operates     49us-gaap_NumberOfStatesInWhichEntityOperates        
Fiscal year              
Duration period of fiscal year     364 days 364 days 371 days    
Stock              
Stock split ratio   1.476us-gaap_StockholdersEquityNoteStockSplitConversionRatio1          
Shares sold in initial public offering 27.8us-gaap_StockIssuedDuringPeriodSharesNewIssues            
Public offering price (in dollars per share) $ 17.00us-gaap_SharePrice           $ 17.00us-gaap_SharePrice
Net proceeds from initial public offering $ 446us-gaap_ProceedsFromIssuanceInitialPublicOffering            
Preferred stock authorized (in shares)           50us-gaap_PreferredStockSharesAuthorized  
Preferred stock issued (in shares)     0us-gaap_PreferredStockSharesIssued        
Foreign Currency Translation              
Foreign currency translation adjustment gain (loss)     (12)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (6)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent      
Merchandise Inventories              
Minimum amount of purchase requirements to earn vendor allowances     0mik_InventoryMinimumAmountOfPurchasesToEarnVendorAllowances        
Vendor allowances recognized     92mik_InventoryVendorAllowances 102mik_InventoryVendorAllowances 110mik_InventoryVendorAllowances    
Vendor allowances as a percentage of net sales     1.90%mik_InventoryVendorAllowancesAsPercentageOfNetSales 2.20%mik_InventoryVendorAllowancesAsPercentageOfNetSales 2.50%mik_InventoryVendorAllowancesAsPercentageOfNetSales    
Minimum open period of the stores subject to which physical inventory counts are performed     1 year        
Minimum number of physical inventory counts in a fiscal year     1mik_MinimumNumberOfPhysicalInventoryCountsInAFiscalYear        
Minimum              
Fiscal year              
Duration period of fiscal year     364 days        
Maximum              
Fiscal year              
Duration period of fiscal year     371 days        
Foreign Currency Translation              
Foreign currency translation adjustment gain (loss)         (1)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Aaron Brothers, Inc.              
Summary of Significant Accounting Policies              
Number of states in which the entity operates     9us-gaap_NumberOfStatesInWhichEntityOperates
/ dei_LegalEntityAxis
= mik_AaronBrothersIncMember
       
PIK Notes              
Stock              
Early extinguishment of debt $ 439us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_PaymentInKindPIKNoteMember