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Inventories - Summary of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013
Inventory Disclosure [Abstract]
Finished goods	$ 2,909	$ 4,052
Work-in-process	1,550	1,678
Materials and components	7,479	7,473
Total inventories	$ 11,938	$ 13,203

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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