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Commitments and contingencies (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended
Jan. 01, 2010
Cynthia Richter, et al. v. Dolgencorp, Inc ("Richter")
employee
Nov. 02, 2012
Cynthia Richter, et al. v. Dolgencorp, Inc ("Richter")
plaintiffs
Nov. 02, 2012
Cynthia Richter, et al. v. Dolgencorp, Inc ("Richter")
Minimum
Nov. 02, 2012
Cynthia Richter, et al. v. Dolgencorp, Inc ("Richter")
Maximum
Nov. 02, 2012
Janet Calvert v. Dolgencorp, Inc ("Calvert")
May 04, 2012
Janet Calvert v. Dolgencorp, Inc ("Calvert")
Apr. 29, 2011
Janet Calvert v. Dolgencorp, Inc ("Calvert")
Apr. 04, 2008
Janet Calvert v. Dolgencorp, Inc ("Calvert")
plaintiffs
Nov. 02, 2012
Janet Calvert v. Dolgencorp, Inc ("Calvert")
May 27, 2011
Winn-Dixie Stores, Inc., et al. v. Dolgencorp, LLC
stores
Nov. 02, 2012
Winn-Dixie Stores, Inc., et al. v. Dolgencorp, LLC
Aug. 10, 2012
Winn-Dixie Stores, Inc., et al. v. Dolgencorp, LLC
stores
Apr. 29, 2011
Interest rate swap settlement
May 28, 2010
Interest rate swap settlement
Jan. 30, 2009
Interest rate swap settlement
Legal proceedings                              
Minimum number of current or former Dollar General store managers to whom notice was mailed 28,000                            
Approximate number of persons who opted into the lawsuit   3,950           2,100              
Approximate number of opt-in plaintiffs dismissed   800                          
Expected period by the court to enter Order implementing its Memorandum Opinion     30 days 60 days                      
Legal fees                 $ 3.25            
Settlement consideration paid into a fund for the class members                 15.5            
Additional legal fees         3                    
Aggregate anticipated settlement                 18.75            
Reimbursement from Employment Practices Liability Insurance (EPLI)           15.9                  
Insurance coverage under Employment Practices Liability Insurance (EPLI)                 20            
Settlement consideration paid           2.8                  
Receivable recorded from Employment Practices Liability Insurance (EPLI)             15.9                
Approximate number of stores co-located with one of the plaintiffs' stores                   55          
Expected amount sought by plaintiffs                     47        
Interest rate swap settlement payment                         9.85   7.60
Demand for additional settlement amount of interest rate swap                           $ 19  
Number of stores for which the court did not dismiss the claims for injunctive relief                       4