Graham Corporation Quarterly report [Sections 13 or 15(d)]

Quarterly report [Sections 13 or 15(d)]

Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail)

Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 123,384	$ 119,577	$ 108,188	$ 105,566	$ 119,577	$ 105,566
Other comprehensive income (loss) before reclassifications	(56)	50	131	(28)
Amounts reclassified from accumulated other comprehensive loss	161	162	150	150
Total other comprehensive income (loss)	105	212	281	122	317	403
Ending Balance	127,590	123,384	112,474	108,188	127,590	112,474
Pension and Other Postretirement Benefits Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6,509)	(6,671)	(6,626)	(6,776)	(6,671)	(6,776)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	161	162	150	150
Total other comprehensive income (loss)	161	162	150	150
Ending Balance	(6,348)	(6,509)	(6,476)	(6,626)	(6,348)	(6,476)
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(266)	(316)	(265)	(237)	(316)	(237)
Other comprehensive income (loss) before reclassifications	(56)	50	131	(28)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Total other comprehensive income (loss)	(56)	50	131	(28)
Ending Balance	(322)	(266)	(134)	(265)	(322)	(134)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6,775)	(6,987)	(6,891)	(7,013)	(6,987)	(7,013)
Ending Balance	$ (6,670)	$ (6,775)	$ (6,610)	$ (6,891)	$ (6,670)	$ (6,610)

- 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.

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- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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