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Inventories - Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jan. 31, 2013	Jul. 31, 2012
Inventory Disclosure [Abstract]
Finished goods	$ 1,370,966	$ 1,291,235	$ 1,267,705
Raw materials	843,380	790,732	771,834
Work-in-process	114,164	152,367	190,935
Inventories, net	$ 2,328,510	$ 2,234,334	$ 2,230,474

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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