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

Annual report pursuant to Section 13 and 15(d)

Debt - Additional Information (Detail)

Debt - Additional Information (Detail)		12 Months Ended
Debt - Additional Information (Detail)	Jun. 01, 2021 USD ($)	Mar. 31, 2023	Mar. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	May 31, 2021 USD ($)	Mar. 31, 2021 USD ($)
Debt Instrument [Line Items]
Line of credit			$ 17,000,000
Unused commitment fee for borrowing	0.25%
Letters of credit outstanding amount			$ 12,233,000					$ 11,567,000
Maximum leverage ratio	3.0	1.0	1.0
Maximum leverage ratio upon acquisition	3.25
Minimum fixed charge coverage ratio	1.2
Percentage of minimum margined assets on outstanding facility	100.00%
EBITDA				$ 1,800,000	$ 0
Minimum funded debt to liquidity prior to occurrence of compliance date			$ 10,000,000
Minimum funded debt to liquidity from and after occurrence of compliance date			20,000,000
Long-term debt payment requirements over the next five years			18,500,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit			11,500,000
Fee for outstanding letters of credit	1.50%
Letters of credit outstanding amount			12,233,000					11,567,000
Availability under the line of credit			$ 191,000
Maximum [Member]
Debt Instrument [Line Items]
Maximum leverage ratio		3.0	4.0
HSBC Bank USA [Member]
Debt Instrument [Line Items]
Letters of credit outstanding amount			$ 7,309,000
HSBC Bank USA [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit	$ 7,500,000						$ 15,000,000
Bank of America [Member]
Debt Instrument [Line Items]
Letters of credit outstanding amount			4,750,000
Back end fee			725,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit			10,250,000
Revolving Credit Facility [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Annual facility fee	$ 5,000
Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of credit						$ 15,000,000
Revolving Credit Facility [Member] \| Maximum [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Fee for outstanding letters of credit	0.85%
Revolving Credit Facility [Member] \| Minimum [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Fee for outstanding letters of credit	0.75%
Revolving Credit Facility [Member] \| Prime Rate [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.00%
Revolving Credit Facility [Member] \| JPMorgan Chase Bank, N.A. [Member]
Debt Instrument [Line Items]
Letters of credit outstanding amount			174,000
Five Year Term Loan With Bank Of America [Member]
Debt Instrument [Line Items]
Term loan payment	$ 20,000,000
Term period of agreement	5 years
Term loan principal payment frequency	monthly
Term loan principal payment	$ 167,000
Five Year Term Loan With Bank Of America [Member] \| BSBY [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%
Five Year Term Loan With Bank Of America [Member] \| Floor Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.00%
Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit	$ 30,000,000		$ 0					$ 0
Maximum limit of credit facility	$ 40,000,000
Debt instrument, basis spread on variable rate			0.13083%
Line of Credit [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of credit			$ 15,000,000
Line of Credit [Member] \| BSBY [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%
Line of Credit [Member] \| Floor Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.00%
Letter of Credit Secured by Cash [Member]
Debt Instrument [Line Items]
Fee for outstanding letters of credit	0.60%