XML 23 R9.htm IDEA: XBRL DOCUMENT

Interim LIFO Calculations	9 Months Ended
Interim LIFO Calculations	Sep. 30, 2011
Inventory Disclosure [Abstract]
Interim LIFO Calculations	NOTE D – Interim LIFO Calculations An actual valuation of inventory under the LIFO method can be made only at the end of each year based on actual inventory levels. Accordingly, interim LIFO calculations must necessarily be based on management's estimates. Since these estimates may be affected by factors beyond management's control, interim results are subject to the final year-end LIFO inventory valuations.