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

Quarterly report pursuant to Section 13 or 15(d)

Changes in Accumulated Other Comprehensive Loss - Reclassifications Out of Accumulated Other Comprehensive Loss by Component (Detail)

Changes in Accumulated Other Comprehensive Loss - Reclassifications Out of Accumulated Other Comprehensive Loss by Component (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before provision for income taxes	$ 5,668	$ 2,009	$ 15,566	$ 11,473
Provision for income taxes	1,676us-gaap_IncomeTaxExpenseBenefit	578us-gaap_IncomeTaxExpenseBenefit	4,996us-gaap_IncomeTaxExpenseBenefit	3,645us-gaap_IncomeTaxExpenseBenefit
Net income	3,992us-gaap_NetIncomeLoss	1,431us-gaap_NetIncomeLoss	10,570us-gaap_NetIncomeLoss	7,828us-gaap_NetIncomeLoss
Reclassifications Out of Accumulated Other Comprehensive Loss [Member] \| Amortization of Unrecognized Prior Service Benefit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before provision for income taxes	25	40	76	121
Reclassifications Out of Accumulated Other Comprehensive Loss [Member] \| Amortization of Actuarial Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before provision for income taxes	(155)	(261)	(465)	(784)
Reclassifications Out of Accumulated Other Comprehensive Loss [Member] \| Pension and Other Postretirement Benefits Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before provision for income taxes	(130)	(221)	(389)	(663)
Provision for income taxes	(46)	(78)	(137)	(234)
Net income	$ (84)	$ (143)	$ (252)	$ (429)

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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