Segment Information (Financial Information By Geographic Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Oct. 31, 2014		Oct. 31, 2013		Oct. 31, 2014		Oct. 31, 2013		Jan. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 6,761,181		$ 6,373,564		$ 20,331,141		$ 18,848,797
Operating Income (Loss)	66,745		63,880		165,951		129,770
Stock-based compensation expense	(3,856)		(1,631)		(9,698)		(6,949)
Depreciation and amortization:	16,762		18,363		52,691		54,438
Capital expenditures	7,752		6,003		19,220		20,937
Identifiable assets	6,665,241				6,665,241				7,169,666
Long-lived assets	66,103				66,103				77,631
Goodwill and acquisition-related intangible assets, net	353,329				353,329				395,855
Operating Expenses, Restatement and Remediation Related	2,064		14,979		19,678		28,965
Gain (Loss) Related to Litigation Settlement	5,059		22,914		5,059		22,914
Loss Contingency Accrual, Period Increase (Decrease)	0		0		(6,229)		0
Americas [Member]
Segment Reporting Information [Line Items]
Net sales	2,644,085	[1]	2,571,750	[1]	7,842,547	[1]	7,489,078	[1]
Operating Income (Loss)	42,194	[2]	53,297	[2]	107,331	[2]	112,516	[2]
Depreciation and amortization:	4,224		4,067		12,530		12,564
Capital expenditures	3,391		1,730		8,243		5,348
Identifiable assets	2,193,403				2,193,403				1,984,895
Long-lived assets	22,508	[1]			22,508	[1]			28,091	[1]
Goodwill and acquisition-related intangible assets, net	8,979				8,979				8,936
Sales to unaffiliated customers, as percentage of total sales	86.00%		87.00%		86.00%		86.00%
Long-lived assets, as percentage of total assets	87.00%				87.00%				90.00%
Operating Expenses, Restatement and Remediation Related	877		3,331		3,933		8,097
Gain (Loss) Related to Litigation Settlement	5,100		22,900		5,100		22,900
Europe
Segment Reporting Information [Line Items]
Net sales	4,117,096		3,801,814		12,488,594		11,359,719
Operating Income (Loss)	28,407	[3],[4]	12,214	[3]	68,318	[3],[4]	24,203	[3]
Depreciation and amortization:	12,538		14,296		40,161		41,874
Capital expenditures	4,361		4,273		10,977		15,589
Identifiable assets	4,471,838				4,471,838				5,184,771
Long-lived assets	43,595				43,595				49,540
Goodwill and acquisition-related intangible assets, net	344,350				344,350				386,919
Operating Expenses, Restatement and Remediation Related	1,187		11,648		15,741		20,868
Loss Contingency Accrual, Period Increase (Decrease)	$ 6,200

[1] Net sales to unaffiliated customers in the United States represented 86% and 87%, respectively, of the total Americas' net sales to unaffiliated customers for the three months ended October 31, 2014 and 2013. Net sales to unaffiliated customers in the United States represented 86% of the total Americas' net sales to unaffiliated customers for each of the nine months ended October 31, 2014 and 2013. Total long-lived assets in the United States represented 87% and 90% of the Americas' total long-lived assets at October 31, 2014 and January 31, 2014, respectively.

[2] Operating income in the Americas for the three months ended October 31, 2014 and 2013 includes restatement and remediation related expenses of $0.9 million and $3.3 million, respectively, and LCD settlements of $5.1 million and $22.9 million, respectively. Operating income in the Americas for the nine months ended October 31, 2014 and 2013 includes restatement and remediation related expenses of $3.9 million and $8.1 million, respectively, and LCD settlements of $5.1 million and $22.9 million, respectively.

[3] Operating income in Europe for the three months ended October 31, 2014 and 2013 includes restatement and remediation related expenses of $1.2 million and $11.6 million, respectively. Operating income in Europe for the nine months ended October 31, 2014 and 2013 includes restatement and remediation related expenses of $15.7 million and $20.9 million, respectively.

[4] Operating income in Europe for the nine months ended October 31, 2014 includes a decrease in an accrual for a value added tax assessment of $6.2 million in one of the Company's subsidiaries in Spain.