Graham Corporation Annual report pursuant to Section 13 and 15(d)

Segment Information - Breakdown of Net Sales by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 22,301	$ 17,323	$ 22,798	$ 27,617	$ 37,455	$ 33,646	$ 35,566	$ 28,502	$ 90,039	$ 135,169	$ 102,218
Africa [Member]
Segment Reporting Information [Line Items]
Net sales									112	237	152
Asia [Member]
Segment Reporting Information [Line Items]
Net sales									8,859	11,253	11,486
Australia & New Zealand [Member]
Segment Reporting Information [Line Items]
Net sales									230	330	307
Canada [Member]
Segment Reporting Information [Line Items]
Net sales									8,702	15,807	11,419
Central America [Member]
Segment Reporting Information [Line Items]
Net sales									36	1,772	3,210
Europe [Member]
Segment Reporting Information [Line Items]
Net sales									856	943	2,091
Mexico [Member]
Segment Reporting Information [Line Items]
Net sales									620	407	728
Middle East [Member]
Segment Reporting Information [Line Items]
Net sales									11,039	10,155	4,350
South America [Member]
Segment Reporting Information [Line Items]
Net sales									2,558	7,866	4,625
U.S. [Member]
Segment Reporting Information [Line Items]
Net sales									$ 57,027	$ 86,399	$ 63,850