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NOTE 1 - OVERVIEW (Detail) | 9 Months Ended
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Dec. 31, 2012
Business Acquisition, Description of Acquired Entity | acquisition of interests in two companies in India
Memorandum of Settlement | Company gave up the 22% minority interest in Sricon in exchange for approximately 5 acres of land in Nagpur
Minimum [Member] |
Number of Mining Sites | 4
Maximum [Member] |
Number of Mining Sites | 7

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- Definition Description of Memorandum of Settlement agreement. + References No definition available. + Details
Name: | igc_MemorandumOfSettlement
Namespace Prefix: | igc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of mining sites. + References No definition available. + Details
Name: | igc_NumberOfMiningSites
Namespace Prefix: | igc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
Name: | us-gaap_BusinessAcquisitionDescriptionOfAcquiredEntity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration