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Stockholders' Equity (Details) (USD $)
6 Months Ended 12 Months Ended 13 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Sep. 27, 2014
Mar. 28, 2015
Feb. 28, 2014
Mar. 28, 2015
Mar. 29, 2014
Mar. 03, 2015
Stockholders' equity                
Amount authorized for repurchase of common stock $ 2,500,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1     $ 2,500,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1   2,500,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1    
Fixed price of share repurchase 918,356,000us-gaap_PaymentsForRepurchaseOfCommonStock 880,816,000us-gaap_PaymentsForRepurchaseOfCommonStock            
Value of shares remaining for repurchase under the current authorization 264,500,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1     264,500,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1   264,500,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1    
Total cost of acquired shares 918,356,000gmcr_StockRepurchasesDuringPeriodAggregateValue   1,052,430,000gmcr_StockRepurchasesDuringPeriodAggregateValue          
Lavazza                
Stockholders' equity                
Number of shares acquired 5,231,991.00gmcr_StockRepurchasesDuringPeriodAggregateShares
/ us-gaap_CounterpartyNameAxis
= gmcr_LuigiLavazzaS.p.A.Member
             
Average price per share of acquired shares (in dollars per share) $ 119.18gmcr_StockRepurchaseProgramAveragePricePerShareOfAcquiredShares
/ us-gaap_CounterpartyNameAxis
= gmcr_LuigiLavazzaS.p.A.Member
             
ASR                
Stockholders' equity                
Number of shares acquired 1,489,476gmcr_StockRepurchasesDuringPeriodAggregateShares
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= gmcr_AcceleratedShareRepurchaseProgramFebruary2014Member
  4,340,508gmcr_StockRepurchasesDuringPeriodAggregateShares
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= gmcr_AcceleratedShareRepurchaseProgramFebruary2014Member
5,829,984gmcr_StockRepurchasesDuringPeriodAggregateShares
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= gmcr_AcceleratedShareRepurchaseProgramFebruary2014Member
       
Average price per share of acquired shares (in dollars per share) $ 120.07gmcr_StockRepurchaseProgramAveragePricePerShareOfAcquiredShares
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= gmcr_AcceleratedShareRepurchaseProgramFebruary2014Member
    $ 120.07gmcr_StockRepurchaseProgramAveragePricePerShareOfAcquiredShares
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= gmcr_AcceleratedShareRepurchaseProgramFebruary2014Member
       
ASR | Bank                
Stockholders' equity                
Fixed price of share repurchase         700,000,000us-gaap_PaymentsForRepurchaseOfCommonStock
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= gmcr_AcceleratedShareRepurchaseProgramFebruary2014Member
/ us-gaap_CounterpartyNameAxis
= gmcr_MajorFinancialInstitutionMember
  700,000,000us-gaap_PaymentsForRepurchaseOfCommonStock
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= gmcr_AcceleratedShareRepurchaseProgramFebruary2014Member
/ us-gaap_CounterpartyNameAxis
= gmcr_MajorFinancialInstitutionMember
 
Number of shares acquired         4,340,508gmcr_StockRepurchasesDuringPeriodAggregateShares
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= gmcr_AcceleratedShareRepurchaseProgramFebruary2014Member
/ us-gaap_CounterpartyNameAxis
= gmcr_MajorFinancialInstitutionMember
1,489,476gmcr_StockRepurchasesDuringPeriodAggregateShares
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= gmcr_AcceleratedShareRepurchaseProgramFebruary2014Member
/ us-gaap_CounterpartyNameAxis
= gmcr_MajorFinancialInstitutionMember
   
Common stock                
Stockholders' equity                
Number of shares acquired 9,040,431gmcr_StockRepurchasesDuringPeriodAggregateShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
             
Total cost of acquired shares 904,000gmcr_StockRepurchasesDuringPeriodAggregateValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
             
Common stock | Lavazza                
Stockholders' equity                
Fixed price of share repurchase 623,600,000us-gaap_PaymentsForRepurchaseOfCommonStock
/ us-gaap_CounterpartyNameAxis
= gmcr_LuigiLavazzaS.p.A.Member
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
            623,600,000us-gaap_PaymentsForRepurchaseOfCommonStock
/ us-gaap_CounterpartyNameAxis
= gmcr_LuigiLavazzaS.p.A.Member
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Number of shares acquired 5,231,991gmcr_StockRepurchasesDuringPeriodAggregateShares
/ us-gaap_CounterpartyNameAxis
= gmcr_LuigiLavazzaS.p.A.Member
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
            5,231,991gmcr_StockRepurchasesDuringPeriodAggregateShares
/ us-gaap_CounterpartyNameAxis
= gmcr_LuigiLavazzaS.p.A.Member
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Average price per share of acquired shares (in dollars per share)               $ 119.18gmcr_StockRepurchaseProgramAveragePricePerShareOfAcquiredShares
/ us-gaap_CounterpartyNameAxis
= gmcr_LuigiLavazzaS.p.A.Member
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Stock repurchase price discount, as a percent               3.00%gmcr_StockRepurchaseProgramPricePerShareAsPercentageOfFairValueAtMostRecentClosingDate
/ us-gaap_CounterpartyNameAxis
= gmcr_LuigiLavazzaS.p.A.Member
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Additional paid-in capital                
Stockholders' equity                
Total cost of acquired shares $ 917,452,000gmcr_StockRepurchasesDuringPeriodAggregateValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
             
Open market                
Stockholders' equity                
Number of shares acquired 2,318,964gmcr_StockRepurchasesDuringPeriodAggregateShares
/ gmcr_ShareRepurchaseTransactionTypeAxis
= gmcr_OpenMarketShareRepurchaseTransactionMember
  3,798,084gmcr_StockRepurchasesDuringPeriodAggregateShares
/ gmcr_ShareRepurchaseTransactionTypeAxis
= gmcr_OpenMarketShareRepurchaseTransactionMember
         
Average price per share of acquired shares (in dollars per share) $ 127.12gmcr_StockRepurchaseProgramAveragePricePerShareOfAcquiredShares
/ gmcr_ShareRepurchaseTransactionTypeAxis
= gmcr_OpenMarketShareRepurchaseTransactionMember
  $ 92.79gmcr_StockRepurchaseProgramAveragePricePerShareOfAcquiredShares
/ gmcr_ShareRepurchaseTransactionTypeAxis
= gmcr_OpenMarketShareRepurchaseTransactionMember