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Inventories - Components of Inventories (Detail) (USD $)	Jul. 31, 2014	Jan. 31, 2014	Jul. 31, 2013
Inventory Disclosure [Abstract]
Finished goods	$ 1,453,175,000	$ 1,333,926,000	$ 1,370,966,000
Raw materials	933,311,000	874,799,000	843,380,000
Work-in-process	144,965,000	117,855,000	114,164,000
Inventories, net	$ 2,531,451,000	$ 2,326,580,000	$ 2,328,510,000

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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