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Major Class of Inventory (Detail) (USD $) In Thousands, unless otherwise specified | May 31, 2013 | May 31, 2012
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Schedule of Inventory [Line Items] |  |
Raw material and supplies | $ 185,590 | $ 160,869
Finished goods | 363,090 | 329,109
Total Inventory | $ 548,680 | $ 489,978

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