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Pro Forma Results of Operations (Detail) (Elcom, USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Oct. 31, 2011	Oct. 31, 2011
Elcom
Business Acquisition [Line Items]
Revenues	$ 16,850	$ 35,837
Operating profit	1,262	3,074
Net income	$ 672	$ 1,984
Earnings per share- basic	$ 0.08	$ 0.24
Earnings per share- diluted	$ 0.08	$ 0.23

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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