XML 47 R34.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Leases (Tables) | 12 Months Ended
--- | ---
Mar. 31, 2016
Leases [Abstract] |
Summary of Property, Plant and Equipment | Property, plant and equipment include the following amounts for leases which have been capitalized:
|  | March 31, |
|  | 2016 |  |  | 2015 |
Machinery and equipment |  | $ | 280 |  |  | $ | 288 |
Less accumulated amortization |  |  | 75 |  |  |  | 135 |
|  | $ | 205 |  |  | $ | 153 |
Future Minimum Payments Required under Non-cancelable Leases | As of March 31, 2016, future minimum payments required under non-cancelable leases are:
|  | Operating Leases |  |  | Capital Leases |
2017 |  | $ | 580 |  |  | $ | 64 |
2018 |  |  | 408 |  |  |  | 62 |
2019 |  |  | 364 |  |  |  | 55 |
2020 |  |  | 353 |  |  |  | 33 |
2021 |  |  | 238 |  |  |  | 18 |
Total minimum lease payments |  | $ | 1,943 |  |  | $ | 232 |
Less – amount representing interest |  |  |  |  |  |  | 20 |
Present value of net minimum lease payments |  |  |  |  |  | $ | 212 |

X
- Definition Tabular disclosure of future minimum lease payments for capital and operating leases as of the date of the latest balance sheet presented, in aggregate and for each of the five succeeding fiscal years, with separate deductions from the total for the amount representing executor costs, including any profit thereon, included in the minimum lease payments and for the amount of the imputed interest necessary to reduce the net minimum lease payments to present value. + References No definition available. + Details
Name: | ghm_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesAndOperatingLeasesTableTextBlock
Namespace Prefix: | ghm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of long-lived, depreciable assets that are subject to a lease meeting the criteria for capitalization and are used in the normal conduct of business to produce goods and services. Examples may include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
Name: | us-gaap_ScheduleOfCapitalLeasedAsssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration