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Major Classes of Inventories (Detail) (USD $) In Thousands, unless otherwise specified | Aug. 31, 2012 | May 31, 2012
--- | --- | ---
Inventory [Line Items] |  |  |
Raw material and supplies | $ 182,352 |  | $ 160,869
Finished goods | 342,971 |  | 329,109
Total Inventory | $ 525,323 | [1] | $ 489,978
[1] | Restated

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