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Inventories (Details) (USD $) In Thousands, unless otherwise specified	May 31, 2014	May 31, 2013
Inventories
Raw materials	$ 24,734us-gaap_InventoryRawMaterials	$ 18,362us-gaap_InventoryRawMaterials
Work in process	11,992us-gaap_InventoryWorkInProcess	11,006us-gaap_InventoryWorkInProcess
Finished goods	24,508us-gaap_InventoryFinishedGoods	25,711us-gaap_InventoryFinishedGoods
Total	$ 61,234us-gaap_InventoryNet	$ 55,079us-gaap_InventoryNet

X

- Definition

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)

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-Publisher FASB

-Name Accounting Standards Codification

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

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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.

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- Definition

Amount before valuation and LIFO reserves of raw materials 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 SEC

-Name Regulation S-X (SX)

-Number 210

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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.

+ References

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

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-Name Regulation S-X (SX)

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