Segment Information (Financial Information By Geographic Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jul. 31, 2013		Jul. 31, 2012		Jul. 31, 2013		Jul. 31, 2012		Jan. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 6,327,476		$ 5,968,419	[1]	$ 12,475,233		$ 11,878,482	[1]
Operating Income (Loss)	29,859		60,311	[1]	65,890		142,769	[1]
Stock-based compensation expense	(2,227)		(3,666)		(5,318)		(6,607)
Depreciation and amortization	18,108		13,193		36,075		26,590
PropertyPlantandEquipmentandSoftware	7,200		9,008		14,934		23,266
Identifiable assets	6,234,071				6,234,071				6,830,960
Property and equipment, net	79,295				79,295				84,395
Acquisition-related intangible assets, net	386,892				386,892				412,500
Americas
Segment Reporting Information [Line Items]
Net sales	2,624,546	[2]	2,407,168	[2]	4,917,328	[2]	4,864,656	[2]
Operating Income (Loss)	31,988		29,868		59,219		79,646
Depreciation and amortization	4,251		4,039		8,497		7,821
PropertyPlantandEquipmentandSoftware	1,921		4,204		3,618		13,965
Identifiable assets	2,049,959				2,049,959				2,004,295
Property and equipment, net	27,639	[2]			27,639	[2]			30,492	[2]
Acquisition-related intangible assets, net	2,966				2,966				2,966
Sales to unaffiliated customers, as percentage of total sales	86.00%		86.00%		85.00%		84.00%
Long-lived assets, as percentage of total assets	90.00%				90.00%				90.00%
Europe
Segment Reporting Information [Line Items]
Net sales	3,702,930		3,561,251		7,557,905		7,013,826
Operating Income (Loss)	98		34,109		11,989		69,730
Depreciation and amortization	13,857		9,154		27,578		18,769
PropertyPlantandEquipmentandSoftware	5,279		4,804		11,316		9,301
Identifiable assets	4,184,112				4,184,112				4,826,665
Property and equipment, net	51,656				51,656				53,903
Acquisition-related intangible assets, net	$ 383,926				$ 383,926				$ 409,534

[1] See Note 2 - Restatement of Consolidated Financial Statements.

[2] Net sales to unaffiliated customers in the United States represented 86% of the total Americas' net sales to unaffiliated customers for each of the fiscal quarters ended July 31, 2013 and July 31, 2012. Net sales to unaffiliated customers in the United States represented 85% and 84%, respectively, of the total Americas' net sales to unaffiliated customers for the six months ended July 31, 2013 and July 31, 2012. Total long-lived assets in the United States represented 90% of the Americas' total long-lived assets at both July 31, 2013 and January 31, 2013.