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Assets Held For Sale - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Jul. 31, 2012 AirCraft	Apr. 30, 2012 AirCraft	Apr. 30, 2011
Assets Held For Sale [Line Items]
Minimum period for sale of aircrafts and buildings held for sale		1 year	1 year
Number of long lived assets reclassified as held for use		1	3
Disposal of Composites business to third party	$ 750,000
Discontinued operations, building and equipment, net book value				8,000,000
Discontinued operations, working capital				$ 6,600,000

For the disposal group, including a component of the entity (discontinued operation), carrying value (net of accumulated depreciation and any write-downs) of tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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