Segment Information (Financial Information By Geographic Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2014		Apr. 30, 2013		Jan. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 6,728,151		$ 6,147,757
Operating Income (Loss)	31,496		36,031
Stock-based compensation expense	(1,973)		(3,091)
Depreciation and amortization	18,216		17,967
Capital expenditures	4,227		7,734
Identifiable assets	7,015,003				7,169,666
Long-lived assets	75,856				77,631
Goodwill and acquisition-related intangible assets, net	398,791				395,855
Operating Expenses, Restatement	12,236		3,023
Americas
Segment Reporting Information [Line Items]
Net sales	2,476,271	[1]	2,292,782	[1]
Operating Income (Loss)	26,283	[2]	27,231	[2]
Depreciation and amortization	4,118		4,246
Capital expenditures	1,482		1,697
Identifiable assets	2,091,133				1,984,895
Long-lived assets	26,587	[1]			28,091
Goodwill and acquisition-related intangible assets, net	9,320				8,936
Sales to unaffiliated customers, as percentage of total sales	83.00%		83.00%
Long-lived assets, as percentage of total assets	90.00%				90.00%
Operating Expenses, Restatement	2,900		1,800
Europe [Member]
Segment Reporting Information [Line Items]
Net sales	4,251,880		3,854,975
Operating Income (Loss)	7,186	[3]	11,891	[3]
Depreciation and amortization	14,098		13,721
Capital expenditures	2,745		6,037
Identifiable assets	4,923,870				5,184,771
Long-lived assets	49,269				49,540
Goodwill and acquisition-related intangible assets, net	389,471				386,919
Operating Expenses, Restatement	$ 9,400		$ 1,300

[1] Net sales to unaffiliated customers in the United States represented 83% of the total Americas' net sales to unaffiliated customers for each of the fiscal quarters ended April 30, 2014 and April 30, 2013. Total long-lived assets in the United States represented 90% of the Americas' total long-lived assets at both April 30, 2014 and January 31, 2014.

[2] Operating income in the Americas for the fiscal quarters ended April 30, 2014 and 2013 includes restatement-related expenses of $2.9 million and $1.8 million, respectively.

[3] Operating income in Europe for the fiscal quarters ended April 30, 2014 and 2013 includes restatement-related expenses of $9.4 million and $1.3 million, respectively.