The additional area of real estate pledged as collateral beyond that already pledged for the predecessor instrument.

No definition available.

Name:	grif_AdditionalAreaOfRealEstatePledgedAsCollateral
Namespace Prefix:	grif_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the net gain (loss) anticipated over the terms of agreements during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

+ References

No definition available.

+ Details

Name:	grif_AnticipatedGainLossOnCashFlowHedgeIneffectivenessNet
Namespace Prefix:	grif_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Area of real estate that have been pledged as collateral for borrowings.

+ References

No definition available.

+ Details

Name:	grif_AreaOfRealEstatePledgedAsCollateral
Namespace Prefix:	grif_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the amortization period of the debt instrument.

+ References

No definition available.

+ Details

Name:	grif_DebtInstrumentAmortizationPeriod
Namespace Prefix:	grif_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the amount used to refinance the existing mortgage.

+ References

No definition available.

+ Details

Name:	grif_DebtRefinancedAmount
Namespace Prefix:	grif_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The designation of funds furnished by a borrower to a lender until the remaining square footage of the building is leased and tenant improvements have been completed with respect to the mortgaged property.

+ References

No definition available.

+ Details

Name:	grif_EscrowDepositLeasingCompletion
Namespace Prefix:	grif_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Space currently under lease at the time of initial borrowing.

+ References

No definition available.

+ Details

Name:	grif_LeasedSpaceForBorrowing
Namespace Prefix:	grif_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of buildings, such as office or industrial/warehouse, used as collateral for a debt instrument.

+ References

No definition available.

+ Details

Name:	grif_NumberOfBuildingsUsedAsCollateral
Namespace Prefix:	grif_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of interest rate derivatives containing credit risk related contingent features.

+ References

No definition available.

+ Details

Name:	grif_NumberOfInterestRateDerivativesContainingCreditRiskRelatedContingentFeatures
Namespace Prefix:	grif_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of subsidiaries.

+ References

No definition available.

+ Details

Name:	grif_NumberOfSubsidiaries
Namespace Prefix:	grif_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

+ Details

Name:	us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

+ Details

Name:	us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

+ Details

Name:	us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtOtherDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Total amount of new mortgage loans on real estate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.6)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateNewMortgageLoans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959

+ Details

Name:	us-gaap_NumberOfInterestRateDerivativesHeld
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss), attributable to parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569643-111683

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569616-111683

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

+ Details

Name:	us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfSecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

+ Details

Name:	us-gaap_SecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=grif_NonrecourseVariableRateMortgageDueOn2October2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=grif_NonrecourseVariableRateMortgageDueOn1February2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=grif_NonrecourseVariableRateMortgageDueOn1August2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=grif_NonrecourseVariableRateMortgageDueOn27January2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=grif_NonrecourseVariableRateMortgageDueOn2January2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_EntityByLocationAxis=grif_LocationOnePropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_EntityByLocationAxis=grif_LocationTwoPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=grif_NonrecourseVariableRateMortgageDueOn1September2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=grif_NonrecourseVariableRateMortgageDueOn1May2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=grif_NonrecourseMortgage509PercentDueOn1July2029GcdMortgageLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=grif_NonrecourseMortgage509PercentDueOn1July2029TdMortgageLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=grif_NonrecourseMortgage433PercentDueOn1August2030MortgageLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=grif_NonrecourseMortgages5.73PercentDueOn1August2015Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=grif_NonrecourseMortgageProceedsExcludingContingentPortionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=grif_NonrecourseMortgageContingentPortionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Mortgage Loan (Details) $ in Thousands						3 Months Ended			6 Months Ended
Mortgage Loan (Details) $ in Thousands	Apr. 26, 2016 USD ($) ft² building	Dec. 11, 2015 USD ($) subsidiary	Sep. 01, 2015 USD ($) ft² derivative subsidiary	Jul. 29, 2015 USD ($) ft² building	Dec. 31, 2014 USD ($) ft² derivative	May 31, 2016 USD ($) item	Feb. 29, 2016 USD ($)	Nov. 30, 2015 USD ($) ft²	May 31, 2016 USD ($) item	May 31, 2015 USD ($)	Dec. 10, 2015 USD ($)
Long-Term Debt
Mortgage loans						$ 100,537		$ 90,436	$ 100,537
Debt disclosures
Proceeds from issuance of debt									18,800	$ 10,891
Term of debt					10 years
Ineffectiveness on cash flow hedges									0
Anticipated ineffectiveness on cash flow hedges									0
Net fair values of interest rate swap agreements included in other liabilities						4,046		3,981	4,046
Other liabilities caption
Debt disclosures
Net fair values of interest rate swap agreements included in other liabilities						3,858			3,858
Nonrecourse variable rate loans, due October 2, 2017
Long-Term Debt
Mortgage loans						6,127		6,217	6,127
Nonrecourse variable rate loans, due February 1, 2019
Long-Term Debt
Mortgage loans						10,464		10,610	10,464
Nonrecourse variable rate loans, due August 1, 2019
Long-Term Debt
Mortgage loans	$ 7,418							7,501
Debt disclosures
Number Of Buildings Used As Collateral \| building	4
Area of collateralized properties (in square feet) \| ft²	240,000
Nonrecourse variable rate loans, due January 27, 2020
Long-Term Debt
Mortgage loans						3,668		3,729	3,668
Nonrecourse variable rate loans, due January 2, 2025
Long-Term Debt
Mortgage loans						20,994		19,385	20,994
Debt disclosures
Proceeds from issuance of debt					$ 10,891
Term of debt					10 years
Amortization period of debt					25 years
Number of subsidiaries which are party to the mortgage \| subsidiary		2
Debt amount refinanced					$ 8,859
Nonrecourse variable rate loans, due January 2, 2025 \| Location 1
Debt disclosures
Area of collateralized properties (in square feet) \| ft²					303,000
Leased space \| ft²					201,000
Nonrecourse variable rate loans, due January 2, 2025 \| Location 2
Debt disclosures
Area of collateralized properties (in square feet) \| ft²					228,000
Nonrecourse variable rate mortgage, due September 1, 2025
Long-Term Debt
Mortgage loans						13,896		11,457	13,896
Debt disclosures
Area of collateralized properties (in square feet) \| ft²			280,000
Term of debt			10 years
Amortization period of debt			25 years
Leased space \| ft²			196,000
Number of subsidiaries which are party to the mortgage \| subsidiary			1
Nonrecourse Variable Rate Mortgage Due On 1 May 2026 [Member]
Long-Term Debt
Mortgage loans						14,350			14,350
Debt disclosures
New mortgage	$ 14,350
Number Of Buildings Used As Collateral \| building	4
Proceeds from issuance of debt	$ 6,932
Term of debt	10 years
Amortization period of debt	25 years
Additional area serving as collateral \| ft²	98,000
Nonrecourse Variable Rate Mortgage Due On 1 May 2026 [Member] \| Location 1
Debt disclosures
Leased space \| ft²	58,000
Nonrecourse Variable Rate Mortgage Due On 1 May 2026 [Member] \| Location 2
Debt disclosures
Leased space \| ft²	40,000
5.09%, due July 1, 2029 GCD mortgage loan
Long-Term Debt
Mortgage loans						$ 7,195		$ 7,385	$ 7,195
Interest rate (as a percent)						5.09%		5.09%	5.09%
5.09%, due July 1, 2029 TD mortgage Loan
Long-Term Debt
Mortgage loans						$ 6,066		$ 6,226	$ 6,066
Interest rate (as a percent)						5.09%		5.09%	5.09%
4.33%, due August 1, 2030 mortgage loan
Long-Term Debt
Mortgage loans						$ 17,777		$ 17,926	$ 17,777
Interest rate (as a percent)						4.33%		4.33%	4.33%
Debt disclosures
New mortgage				$ 18,000
Number Of Buildings Used As Collateral \| building				3
Proceeds from issuance of debt				$ 14,875
Term of debt				15 years
Amortization period of debt				30 years
Nonrecourse mortgages: 5.73%, due August 1, 2015
Long-Term Debt
Mortgage loans				$ 17,891
Interest rate (as a percent)				5.73%
Debt disclosures
Number Of Buildings Used As Collateral \| building				3
Area of collateralized properties (in square feet) \| ft²				392,000
Interest rate swap agreement
Debt disclosures
Number of agreements containing credit risk related contingent features \| item						0			0
Recognized net losses (included in other comprehensive loss), before taxes, on interest rate swap agreements									$ 1,769	$ 727
Loss expected to be reclassified over next twelve months from accumulated other comprehensive loss to interest expense						$ 1,238			$ 1,238
Interest rate swap agreement \| Nonrecourse variable rate loans, due August 1, 2019
Debt disclosures
Fixed interest rate pursuant to interest rate swap agreement (as a percent)	6.58%
Interest rate swap agreement \| Nonrecourse variable rate loans, due January 2, 2025
Debt disclosures
Fixed interest rate pursuant to interest rate swap agreement (as a percent)					4.39%
Number of interest rate swap derivatives \| derivative					3
Interest rate swap agreement \| Nonrecourse variable rate mortgage, due September 1, 2025
Debt disclosures
Fixed interest rate pursuant to interest rate swap agreement (as a percent)			3.75%
Number of interest rate swap derivatives \| derivative			2
Interest rate swap agreement \| Nonrecourse Variable Rate Mortgage Due On 1 May 2026 [Member]
Debt disclosures
Fixed interest rate pursuant to interest rate swap agreement (as a percent)	4.17%
Nonrecourse Mortgage, Proceeds Excluding Contingent Portion [Member] \| Nonrecourse variable rate mortgage, due September 1, 2025
Debt disclosures
Proceeds from issuance of debt			$ 11,500
Nonrecourse Mortgage, Proceeds Excluding Contingent Portion [Member] \| Interest rate swap agreement \| Nonrecourse variable rate loans, due January 2, 2025
Debt disclosures
Fixed interest rate pursuant to interest rate swap agreement (as a percent)					4.43%
Nonrecourse Mortgage, Proceeds Excluding Contingent Portion [Member] \| Interest rate swap agreement \| Nonrecourse variable rate mortgage, due September 1, 2025
Debt disclosures
Fixed interest rate pursuant to interest rate swap agreement (as a percent)			3.77%
Notional amount of interest rate swap agreement			$ 11,500
Nonrecourse Mortgage, Contingent Portion [Member] \| Nonrecourse variable rate loans, due January 2, 2025
Debt disclosures
Proceeds held in escrow		$ 1,850
Nonrecourse Mortgage, Contingent Portion [Member] \| Nonrecourse variable rate loans, due January 2, 2025 \| Location 1
Debt disclosures
Leased space \| ft²					102,000
Nonrecourse Mortgage, Contingent Portion [Member] \| Nonrecourse variable rate mortgage, due September 1, 2025
Debt disclosures
Proceeds held in escrow											$ 2,600
Nonrecourse Mortgage, Contingent Portion [Member] \| 4.33%, due August 1, 2030 mortgage loan
Debt disclosures
Proceeds from issuance of debt				$ 25		$ 600	$ 25	$ 2,500
Leased space \| ft²								88,000
Proceeds held in escrow				$ 3,125
Nonrecourse Mortgage, Contingent Portion [Member] \| Interest rate swap agreement \| Nonrecourse variable rate loans, due January 2, 2025
Debt disclosures
Fixed interest rate pursuant to interest rate swap agreement (as a percent)					3.88%
Notional amount of interest rate swap agreement					$ 1,850
Nonrecourse Mortgage, Contingent Portion [Member] \| Interest rate swap agreement \| Nonrecourse variable rate mortgage, due September 1, 2025
Debt disclosures
Fixed interest rate pursuant to interest rate swap agreement (as a percent)			3.67%
Notional amount of interest rate swap agreement			$ 2,600
LIBOR \| Nonrecourse variable rate loans, due August 1, 2019
Debt disclosures
Variable interest rate margin (as a percent)	3.08%
LIBOR \| Nonrecourse variable rate loans, due January 2, 2025
Debt disclosures
Variable interest rate margin (as a percent)					1.95%
LIBOR \| Nonrecourse variable rate mortgage, due September 1, 2025
Debt disclosures
Variable interest rate margin (as a percent)			1.65%
LIBOR \| Nonrecourse Variable Rate Mortgage Due On 1 May 2026 [Member]
Debt disclosures
Variable interest rate margin (as a percent)	2.00%