Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2013	May 31, 2013
Working Capital Detail [Line Items]
Inventories	$ 112,557	$ 105,054
Lifo Cost
Working Capital Detail [Line Items]
Finished products	7,171	5,267
Work in process	9,534	8,630
Raw materials	20,478	20,090
Total inventories at LIFO cost	37,183	33,987
Average Cost
Working Capital Detail [Line Items]
Finished products	22,077	21,836
Raw materials	406	378
Parts and supplies	52,891	48,853
Total inventories at average cost	$ 75,374	$ 71,067

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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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- 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

-SubTopic 10

-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

-Name Regulation S-X (SX)

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-Publisher FASB

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-Publisher AICPA

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-Publisher FASB

-Name Accounting Standards Codification

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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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