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Statements of Shareholders' Equity (USD $)
Total
COMMON STOCK
ADDITIONAL PAID-IN CAPITAL
ACCUMULATED DEFICIT
Beginning balance at Oct. 31, 2013 $ (21,295)us-gaap_StockholdersEquity $ 1,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   $ (22,295)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Beginning balance, shares at Oct. 31, 2013   10,000,000us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Convertible notes exercised at a price of $0.00825 per share 82,500us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities 1,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
81,500us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  
Convertible notes exercised at a price of $0.00825 per share, Shares   10,000,000us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Subscriptions received under initial public offering at $0.25 per share 500,000grep_SubscriptionsReceivedValueUnderInitialPublicOffering 200grep_SubscriptionsReceivedValueUnderInitialPublicOffering
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
499,800grep_SubscriptionsReceivedValueUnderInitialPublicOffering
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  
Subscriptions received under initial public offering at $0.25 per share, Shares   2,000,000grep_SubscriptionsReceivedSharesUnderInitialPublicOffering
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Subscriptions received under private placements at $0.25 per share 105,700grep_SubscriptionsReceivedValueUnderPrivatePlacements 42grep_SubscriptionsReceivedValueUnderPrivatePlacements
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
105,658grep_SubscriptionsReceivedValueUnderPrivatePlacements
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  
Subscriptions received under private placements at $0.25 per share, Shares   422,800grep_SubscriptionsReceivedSharesUnderPrivatePlacements
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Net Income (Loss) for the year (106,343)us-gaap_NetIncomeLoss       (106,343)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Ending balance at Oct. 31, 2014 $ 560,562us-gaap_StockholdersEquity $ 2,242us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 686,958us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (128,638)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Ending balance, shares at Oct. 31, 2014   22,422,800us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember