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Inventories - Schedule of Inventories from Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	May 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 5,751us-gaap_InventoryRawMaterials	$ 5,135us-gaap_InventoryRawMaterials
Work in process	2,848us-gaap_InventoryWorkInProcess	3,174us-gaap_InventoryWorkInProcess
Finished goods	708us-gaap_InventoryFinishedGoods	318us-gaap_InventoryFinishedGoods
Total inventories	$ 9,307us-gaap_InventoryNet	$ 8,627us-gaap_InventoryNet

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Name Accounting Standards Codification

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-Subparagraph (SX 210.5-02.6(a)(1))

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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-Name Regulation S-X (SX)

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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-Name Regulation S-X (SX)

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