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

Annual report pursuant to Section 13 and 15(d)

Segment Information - Breakdown of Net Sales by Geographic Area (Detail)

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	$ 37,455us-gaap_SalesRevenueNet	$ 33,646us-gaap_SalesRevenueNet	$ 35,566us-gaap_SalesRevenueNet	$ 28,502us-gaap_SalesRevenueNet	$ 26,087us-gaap_SalesRevenueNet	$ 23,385us-gaap_SalesRevenueNet	$ 24,490us-gaap_SalesRevenueNet	$ 28,256us-gaap_SalesRevenueNet	$ 135,169us-gaap_SalesRevenueNet	$ 102,218us-gaap_SalesRevenueNet	$ 104,973us-gaap_SalesRevenueNet
Africa [Member]
Segment Reporting Information [Line Items]
Net sales									237	152	235
Asia [Member]
Segment Reporting Information [Line Items]
Net sales									11,253	11,486	17,048
Australia & New Zealand [Member]
Segment Reporting Information [Line Items]
Net sales									330	307	29
Canada [Member]
Segment Reporting Information [Line Items]
Net sales									15,807	11,419	7,084
Central America [Member]
Segment Reporting Information [Line Items]
Net sales									1,772	3,210	4,633
Europe [Member]
Segment Reporting Information [Line Items]
Net sales									943	2,091	2,027
Mexico [Member]
Segment Reporting Information [Line Items]
Net sales									407	728	89
Middle East [Member]
Segment Reporting Information [Line Items]
Net sales									10,155	4,350	14,834
South America [Member]
Segment Reporting Information [Line Items]
Net sales									7,866	4,625	3,299
U.S. [Member]
Segment Reporting Information [Line Items]
Net sales									$ 86,399	$ 63,850	$ 55,695