XML 112 R49.htm IDEA: XBRL DOCUMENT
v3.3.0.814

ACQUISITIONS (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 16, 2015 | May. 21, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
ACQUISITIONS (Details) [Line Items] |  |  |  |  |  |
Acquired business, net of cash acquired |  |  |  | $ 2,225 | $ 62,306 | $ 0
Guarantor Subsidiaries [Member] |  |  |  |  |  |
ACQUISITIONS (Details) [Line Items] |  |  |  |  |  |
Acquired business, net of cash acquired |  |  |  | $ 2,225 | (2,675) |
Babcock Lumber Company Operational Woodmill [Member] |  |  |  |  |  |
ACQUISITIONS (Details) [Line Items] |  |  |  |  |  |
Business combination, consideration transferred | $ 2,225 |  |  |  |  |
Cyclone [Member] |  |  |  |  |  |
ACQUISITIONS (Details) [Line Items] |  |  |  |  |  |
Business combination, consideration transferred |  | $ 40,000 |  |  |  |
Business acquisition, transaction costs |  |  |  |  | 2,363 |
Northcote Pottery [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |
ACQUISITIONS (Details) [Line Items] |  |  |  |  |  |
Acquired business, net of cash acquired |  |  | $ 22,000 |  |  |
Business acquisition, transaction costs |  |  |  |  | $ 798 |

X
- References No definition available. + Details
Name: | gff_ACQUISITIONSDetailsLineItems
Namespace Prefix: | gff_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
Name: | us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
Name: | us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_GuarantorSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=gff_BabcockLumberCompanyOperationalWoodmillMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=gff_CycloneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=gff_NorthcotePotteryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |