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) $ in Thousands		12 Months Ended
Debt - Additional Information (Detail) $ in Thousands	Jun. 01, 2021 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022	Mar. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)
Debt Instrument [Line Items]
Line of credit		$ 17,000
Unused commitment fee for borrowing	0.25%
Letters of credit outstanding amount		12,842		$ 12,233
Percentage of minimum margined assets on outstanding facility	100.00%
EBITDA					$ 1,800	$ 700
Minimum funded debt to liquidity prior to occurrence of compliance date		10,000
Minimum funded debt to liquidity from and after occurrence of compliance date		20,000
Long-term debt payment requirements over the next five years		12,500
Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit		11,500
Fee for outstanding letters of credit	1.50%
Letters of credit outstanding amount		12,842		12,233
Availability under the line of credit		$ 687
Maximum [Member]
Debt Instrument [Line Items]
Maximum leverage ratio	3.0	3.0	4.0
Maximum leverage ratio upon acquisition	3.25
Minimum fixed charge coverage ratio	1.2
Minimum [Member]
Debt Instrument [Line Items]
Maximum leverage ratio	1.0	1.0	1.0
Maximum leverage ratio upon acquisition	1.0
Minimum fixed charge coverage ratio	1.0
HSBC Bank USA [Member]
Debt Instrument [Line Items]
Letters of credit outstanding amount		$ 6,813
HSBC Bank USA [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit	$ 7,500
Bank of America [Member]
Debt Instrument [Line Items]
Letters of credit outstanding amount		5,874
Back end fee		725
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit		10,016
Revolving Credit Facility [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Annual facility fee	$ 5
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%
Five Year Term Loan With Bank Of America [Member]
Debt Instrument [Line Items]
Term loan payment	$ 20,000
Term period of agreement	5 years
Term loan principal payment frequency	monthly
Term loan principal payment	$ 167
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	$ 0		$ 0
Maximum limit of credit facility	$ 40,000
Debt instrument, basis spread on variable rate		4.92%		0.13083%
Line of Credit [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of credit		$ 15,000
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%