Discontinued Operations - Additional Information (Detail) (USD $)	12 Months Ended		0 Months Ended	11 Months Ended	0 Months Ended	6 Months Ended	0 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Jan. 16, 2014 Installment	Jan. 16, 2014	Aug. 30, 2013	Aug. 30, 2013	Mar. 26, 2014
Schedule Of Sale And Divestiture Of Business [Line Items]
Divestiture of business		$ 23,690,000
Gain on sale of subsidiary		3,956,000
Amount of net sales from discontinued operations	1,543,000	23,637,000
Z-Axis Inc
Schedule Of Sale And Divestiture Of Business [Line Items]
Divestiture of business			9,000,000
Amount of net sales from discontinued operations				7,800,000
Amount of pre-tax net income from discontinued operations				600,000
Notes payable in connection with the sale of subsidiary			1,000,000	1,000,000
Gain (loss) on sale of business		5,400,000
Monthly installments receivables from sale of subsidiary, number			59
Monthly installments receivables from sale of subsidiary, amount			25,000	25,000
Monthly installments receivables commencement date			2016-01
Aydin Displays Inc
Schedule Of Sale And Divestiture Of Business [Line Items]
Combination of cash and additional earn-out potential payments					6,000,000	6,000,000
Divestiture of business					15,000,000
Gain on sale of subsidiary		2,900,000
Rental income					600,000
Rental income recognition period					5 years
Amount of hold back provisions held in escrow account					1,200,000	1,200,000
Amount of net sales from discontinued operations						8,300,000
Amount of pre-tax net income from discontinued operations						500,000
Lexel Imaging, Inc.
Schedule Of Sale And Divestiture Of Business [Line Items]
Divestiture of business							3,900,000
Amount of net sales from discontinued operations		7,600,000
Amount of pre-tax net income from discontinued operations		(800,000)
Gain (loss) on sale of business		(4,400,000)
Value of inventories guaranteed to purchase							2,900,000
Purchase commitment period							5 years
Collection period for receivable from divestiture of business							180 days
Amount of cash receivable from divestiture of business							$ 1,000,000