Represents the sale price of the real estate assets under the lease terms based on exercising put option by the entity.

No definition available.

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

- Definition

Represents the selling expenses paid from the sales proceeds in connection with the sale of a discontinued operation.

+ References

No definition available.

+ Details

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Namespace Prefix:	grif_
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- Definition

Represents the selling expenses paid separately (in addition to expense paid from net proceeds) in connection with the sale of a discontinued operation.

+ References

No definition available.

+ Details

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Namespace Prefix:	grif_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Amount of operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Amount of rental income attributable to the disposal group, including a component of the entity (discontinued operation).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Amount of difference between the carrying amount and the sales price of real estate properties sold as part of discontinued operations.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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- Details

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Balance Type:	na
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- Definition

Cash inflow related to a property which is traded for the promise to provide a replacement like-kind property in the near future also known as a tax deferred exempt exchange.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 16

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15, 16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Discontinued Operation (Details) (Manchester, Connecticut warehouse, USD $)	3 Months Ended		9 Months Ended
	Dec. 03, 2011	Aug. 27, 2011	Sep. 01, 2012	Aug. 27, 2011
Manchester, Connecticut warehouse
Discontinued Operation
Selling expenses paid out of proceeds			$ 438,000
Selling expenses paid separately			25,000
Proceeds from sale of real estate assets			15,537,000
Pretax gain included in results for discontinued operation			2,886,000
Proceeds from property sale deposited in escrow account			15,562,000
Manchester warehouse sale price based on exercising of put option under lease	16,000,000
Rental revenue and operating profit from the Manchester warehouse
Rental revenue		408,000	273,000	1,223,000
Operating profit		$ 227,000	$ 221,000	$ 671,000