XML 49 R39.htm IDEA: XBRL DOCUMENT
v3.25.1

Leases (Tables) | 12 Months Ended
--- | ---
Mar. 31, 2025
Leases [Abstract] |
Schedule of Weighted Average Remaining Lease Term and Discount Rate for Finance and Operating Leases | The weighted average remaining lease term and discount rate for finance and operating leases are as follows:
|  | March 31, |
|  | 2025 |  |  | 2024 |
Finance Leases |  |  |  |  |  |
Weighted-average remaining lease term in years |  |  | 2.83 |  |  |  | 3.83 |
Weighted-average discount rate |  |  | 7.75 | % |  |  | 7.75 | %
Operating Leases |  |  |  |  |  |
Weighted-average remaining lease term in years |  |  | 4.94 |  |  |  | 5.93 |
Weighted-average discount rate |  |  | 3.42 | % |  |  | 3.30 | %
Schedule of Components of Lease Expense | The components of lease expense are as follows:
|  | Year Ended March 31, |
|  | 2025 |  |  | 2024 |
Finance lease cost: |  |  |  |  |  |
Amortization of right-of-use assets |  | $ | 13 |  |  | $ | 13 |
Interest on lease liabilities |  |  | 6 |  |  |  | 8 |
Operating lease cost |  |  | 1,527 |  |  |  | 1,478 |
Short-term lease cost |  |  | 25 |  |  |  | 27 |
Total lease cost |  | $ | 1,571 |  |  | $ | 1,526 |
Future Minimum Payments Required under Non-cancelable Leases | As of March 31, 2025, future minimum payments required under non-cancelable leases are:
|  | Operating Leases |  |  | Finance Leases |
2026 |  | $ | 1,480 |  |  | $ | 26 |
2027 |  |  | 1,486 |  |  |  | 26 |
2028 |  |  | 1,428 |  |  |  | 21 |
2029 |  |  | 1,452 |  |  |  | — |
2030 and thereafter |  |  | 1,528 |  |  |  | — |
Total lease payments |  |  | 7,374 |  |  |  | 73 |
Less – amount representing interest |  |  | (585 | ) |  |  | (8 | )
Present value of net minimum lease payments |  | $ | 6,789 |  |  | $ | 65 |

X
- Definition Tabular disclosure of undiscounted cash flows of lessee's operating and finance lease liabilities. Including, but not limited to, reconciliation of undiscounted cash flows to operating and finance lease liabilities recognized in statement of financial position. + References No definition available. + Details
Name: | ghm_LesseeOperatingAndFinanceLeaseLiabilityMaturityTableTextBlock
Namespace Prefix: | ghm_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of weighted average remaining lease term and discount rate for finance and operating leases. + References No definition available. + Details
Name: | ghm_ScheduleOfWeightedAverageRemainingLeaseTermAndDiscountRateForFinanceAndOperatingLeasesTableTextBlock
Namespace Prefix: | ghm_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
Name: | us-gaap_LeaseCostTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types: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