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