XML 63 R35.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Commitments and Contingencies - Narrative (Details) $ in Millions | Sep. 30, 2018 USD ($) vessel | Mar. 31, 2018 USD ($) vessel
--- | --- | ---
Loss Contingencies [Line Items] |  |
Number of multi-purpose service vessels | 2 |
Balance sheet exposure | $ | $ 12.5 |
U.S. Navy [Member] |  |
Loss Contingencies [Line Items] |  |
Number of towing, salvage and rescue vessels |  | 1
Construction in progress | $ |  | $ 63.6
Number of additional vessels |  | 7

X
- Definition Construction In Progress, Number Of Additional Vessels1 + References No definition available. + Details
Name: | gifi_ConstructionInProgressNumberOfAdditionalVessels1
Namespace Prefix: | gifi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Construction In Progress, Number Of Multi-Purpose Service Vessels + References No definition available. + Details
Name: | gifi_ConstructionInProgressNumberOfMultiPurposeServiceVessels
Namespace Prefix: | gifi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Construction In Progress, Number Of Towing, Salvage, And Rescue Ship Vessels + References No definition available. + Details
Name: | gifi_ConstructionInProgressNumberOfTowingSalvageAndRescueShipVessels
Namespace Prefix: | gifi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_ConstructionInProgressGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12021-110248 + Details
Name: | us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_CounterpartyNameAxis=gifi_U.S.NavyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |