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v2.4.1.9

Segment Information - Breakdown of Net Sales by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 37,455 us-gaap_SalesRevenueNet | $ 33,646 us-gaap_SalesRevenueNet | $ 35,566 us-gaap_SalesRevenueNet | $ 28,502 us-gaap_SalesRevenueNet | $ 26,087 us-gaap_SalesRevenueNet | $ 23,385 us-gaap_SalesRevenueNet | $ 24,490 us-gaap_SalesRevenueNet | $ 28,256 us-gaap_SalesRevenueNet | $ 135,169 us-gaap_SalesRevenueNet | $ 102,218 us-gaap_SalesRevenueNet | $ 104,973 us-gaap_SalesRevenueNet
Africa [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 237 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | 152 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | 235 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember
Asia [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 11,253 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember | 11,486 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember | 17,048 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember
Australia & New Zealand [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 330 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = ghm_AustraliaAndNewZealandMember | 307 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = ghm_AustraliaAndNewZealandMember | 29 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = ghm_AustraliaAndNewZealandMember
Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 15,807 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA | 11,419 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA | 7,084 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA
Central America [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,772 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_CentralAmericaMember | 3,210 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_CentralAmericaMember | 4,633 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_CentralAmericaMember
Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 943 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 2,091 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 2,027 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Mexico [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 407 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_MX | 728 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_MX | 89 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_MX
Middle East [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 10,155 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember | 4,350 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember | 14,834 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember
South America [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,866 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | 4,625 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | 3,299 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember
U.S. [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 86,399 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | $ 63,850 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | $ 55,695 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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