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Inventories - Summary of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Apr. 30, 2014
Inventory Disclosure [Abstract]
Finished products	$ 3,137	$ 2,909
Work in process	1,412	1,550
Raw materials	7,881	7,479
Total inventories	$ 12,430us-gaap_InventoryNet	$ 11,938us-gaap_InventoryNet

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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