Graham Corporation Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Additional Information (Detail) $ in Thousands	Jun. 01, 2021 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)
Line of Credit Facility [Line Items]
Term loan, balance		$ 14,184	$ 18,378
Line of credit		17,000
Maximum [Member]
Line of Credit Facility [Line Items]
Maximum leverage ratio upon acquisition	3.25
Minimum fixed charge coverage ratio	1.2
Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit	$ 30,000	0	$ 0
Line of Credit [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Line of credit		15,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit		$ 9,926