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Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	May 31, 2014
Inventory [Line Items]
Raw Materials	$ 23,178us-gaap_InventoryRawMaterialsNetOfReserves	$ 21,515us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process	4,363us-gaap_InventoryWorkInProcessNetOfReserves	3,681us-gaap_InventoryWorkInProcessNetOfReserves
Finished and purchased goods	27,555us-gaap_InventoryFinishedGoodsNetOfReserves	25,982us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories	$ 55,096us-gaap_InventoryNet	$ 51,178us-gaap_InventoryNet

X

- Definition

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

+ References

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-Publisher FASB

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

+ References

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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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