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

Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Detail)

Debt - Additional Information (Detail) - 2015 Revolving Agreement [Member] - USD ($)	9 Months Ended
	Dec. 31, 2015	Dec. 02, 2015
Revolving credit facility [Member]
Debt Instrument [Line Items]
Line of credit		$ 25,000,000
Maximum limit of credit facility		$ 50,000,000
Term period of agreement	5 years
Interest rate description	Interest at either (i) a rate equal to the bank's prime rate; or (ii) a rate equal to LIBOR plus a margin.
Fix rate to reduce fee on outstanding	0.40%
Letters of credit outstanding amount	$ 0
Debt instrument, covenant description	Under the new revolving credit facility, the Company covenants to maintain a maximum funded debt to EBITDA ratio of 3.5 to 1.0 and a minimum earnings before interest expense and income taxes to interest ratio of 4.0 to 1.0. The agreement also provides that the Company is permitted to pay dividends without limitation if it maintains a maximum funded debt to EBITDA ratio equal to or less than 2.0 to 1.0 and permits the Company to pay dividends in an amount equal to 25% of net income if it maintains a maximum funded debt to EBITDA ratio of greater than 2.0 to 1.0.
Maximum funded debt to EBITDA ratio	350.00%
Percentage of net income to be paid as dividend if EBITDA ratio is greater than 2.0 to 1	25.00%
Minimum earnings to interest ratio	400.00%
Revolving credit facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Unused commitment fee for borrowing	0.30%
Fee for outstanding letters of credit	1.20%
Revolving credit facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Unused commitment fee for borrowing	0.20%
Fee for outstanding letters of credit	0.70%
Revolving credit facility [Member] \| Dividend Payment Covenant [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Maximum funded debt to EBITDA ratio	200.00%
Revolving credit facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Revolving credit facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.95%
Bank of America, N.A. [Member]
Debt Instrument [Line Items]
Letters of credit outstanding amount	$ 10,042,000