Inventories (Policies)	3 Months Ended
Inventories (Policies)	Aug. 31, 2013
Accounting Policies [Abstract]
Inventory, Policy [Policy Text Block]	Inventories are valued at the lower of cost or market and include material, labor, and overhead. The inventories of the majority of domestic manufacturing subsidiaries are valued using the last-in, first-out method ("LIFO"). The inventories of all other subsidiaries are valued using the first-in, first-out method.

Disclosure of accounting policy for major classes of inventories, bases of stating inventories (for example, lower of cost or market), methods by which amounts are added and removed from inventory classes (for example, FIFO, LIFO, or average cost), loss recognition on impairment of inventories, and situations in which inventories are stated above cost. If inventory is carried at cost, this disclosure includes the nature of the cost elements included in inventory.

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