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Inventories (Details) (USD $) In Thousands	Jul. 31, 2011	Jan. 31, 2011	Jul. 31, 2010
Inventories
Finished goods	$ 1,035,615	$ 988,085	$ 978,021
Raw materials	656,772	534,879	469,804
Work-in-process	144,487	102,338	105,292
Inventories, net	$ 1,836,874	$ 1,625,302	$ 1,553,117

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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