Working Capital - Inventories (Details) (USD $) In Thousands, unless otherwise specified	May 31, 2013	May 31, 2012
Working Capital Detail [Line Items]
Inventories	$ 105,054	$ 99,441
Lifo Cost
Working Capital Detail [Line Items]
Finished products	5,267	7,664
Work in process	8,630	12,505
Raw materials	20,090	9,449
Total inventories at LIFO cost	33,987	29,618
Average Cost
Working Capital Detail [Line Items]
Finished products	21,836	23,451
Raw materials	378	229
Parts and supplies, and other	48,853	46,143
Total inventories at average cost	$ 71,067	$ 69,823

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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.

+ References

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- Definition

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).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

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- Definition

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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- Definition

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.

+ References

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- Definition

The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-Publisher AICPA

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- Definition

Gross amount of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

+ References

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

-Publisher SEC

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-Publisher FASB

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- Definition

The amount of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods.

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