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Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2012	May 31, 2012
Inventory Disclosure [Line Items]
Raw Materials	$ 16,371	$ 13,997
Work-in-process	3,027	2,110
Finished and purchased goods	18,977	18,885
Inventories	$ 38,375	$ 34,992

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Amount before last-in first-out (LIFO) and valuation reserves of merchandise or goods held by the entity that are readily available for sale.

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Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).

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Gross amount of unprocessed items to be consumed in the manufacturing or production process. Also includes purchased parts that will be used as components of a finished product.

+ References

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Gross amount of merchandise or goods which are partially completed, are generally comprised of raw materials, labor and factory overhead costs, and 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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