XML 52 R53.htm IDEA: XBRL DOCUMENT v2.4.1.9
Revolving Credit Agreement (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 12 Months Ended
Apr. 24, 2013
Nov. 30, 2014
Apr. 24, 2013
Revolving credit agreement      
Area, square feet   280,000us-gaap_AreaOfRealEstateProperty  
Webster Credit Line      
Revolving credit agreement      
Maximum borrowing capacity $ 12,500us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= grif_RevolvingCreditFacilityWithWebsterBankMember
  $ 12,500us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= grif_RevolvingCreditFacilityWithWebsterBankMember
Variable interest rate base one month LIBOR 2.75%  
Aggregate book value of land and buildings pledged as collateral   $ 10,097us-gaap_PledgedAssetsNotSeparatelyReportedRealEstate
/ us-gaap_LongtermDebtTypeAxis
= grif_RevolvingCreditFacilityWithWebsterBankMember
 
Webster Credit Line | Griffin Center South, Bloomfield, CT      
Revolving credit agreement      
Area, square feet 235,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_LongtermDebtTypeAxis
= grif_RevolvingCreditFacilityWithWebsterBankMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= grif_GriffinCenterSouthBloomfieldCTMember
  235,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_LongtermDebtTypeAxis
= grif_RevolvingCreditFacilityWithWebsterBankMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= grif_GriffinCenterSouthBloomfieldCTMember
Webster Credit Line | Single-story office building in Griffin Center      
Revolving credit agreement      
Area, square feet 48,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_LongtermDebtTypeAxis
= grif_RevolvingCreditFacilityWithWebsterBankMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= grif_GriffinCenterMember
  48,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_LongtermDebtTypeAxis
= grif_RevolvingCreditFacilityWithWebsterBankMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= grif_GriffinCenterMember