Discontinued Operations - Additional Information (Detail) (USD $)	6 Months Ended		0 Months Ended	11 Months Ended	0 Months Ended	6 Months Ended	0 Months Ended	12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Jan. 16, 2014 Z-Axis Inc	Jan. 16, 2014 Z-Axis Inc	Aug. 30, 2013 Aydin Displays Inc	Aug. 30, 2013 Aydin Displays Inc	Mar. 26, 2014 Lexel Imaging, Inc.	Feb. 28, 2014 Lexel Imaging, Inc.	Mar. 26, 2014 Lexel Imaging, Inc.
Schedule Of Sale And Divestiture Of Business [Line Items]
Combination of cash and additional earn-out potential payments						$ 6,000,000
Divestiture of business	0	15,000,000	9,000,000		15,000,000		3,900,000
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
Amount of net sales from discontinued operations				7,800,000		8,300,000		7,600,000
Amount of pre-tax net income from discontinued operations				600,000		500,000		(800,000)
Notes payable in connection with the sale of subsidiary				1,000,000
Gain (loss) on sale of business			5,400,000				(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