Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Apr. 30, 2016	Apr. 30, 2015	Jan. 31, 2016
Segment Reporting Information
Net sales to unaffiliated customers:		$ 5,963,362	$ 5,887,229
Operating income:		52,558	81,938
Stock-based compensation expense		(3,657)	(3,818)
Depreciation and amortization:		14,047	14,179
Capital expenditures:		11,563	7,244
Identifiable assets:		6,190,896		$ 6,358,288
Long-lived assets:		71,179		66,028
Goodwill & acquisition-related intangible assets, net:		316,978		310,016
Gain (Loss) Related to Litigation Settlement		443	38,511
Americas
Segment Reporting Information
Net sales to unaffiliated customers:	[1]	2,388,004	2,339,260
Operating income:	[2]	31,275	62,359
Depreciation and amortization:		$ 4,890	$ 4,041
Sales to unaffiliated customers, as percentage of total sales		88.00%	87.00%
Capital expenditures:		$ 6,097	$ 3,864
Identifiable assets:		1,976,795		2,078,443
Long-lived assets:	[1]	32,184		29,402
Goodwill & acquisition-related intangible assets, net:		$ 35,034		$ 35,615
Long-lived assets, as percentage of total assets		95.00%		95.00%
Gain (Loss) Related to Litigation Settlement		$ 443	38,511
Europe
Segment Reporting Information
Net sales to unaffiliated customers:		3,575,358	3,547,969
Operating income:		24,940	23,397
Depreciation and amortization:		9,157	10,138
Capital expenditures:		5,466	$ 3,380
Identifiable assets:		4,214,101		$ 4,279,845
Long-lived assets:		38,995		36,626
Goodwill & acquisition-related intangible assets, net:		$ 281,944		$ 274,401

[1] Net sales to unaffiliated customers in the United States represented 88% and 87%, respectively, of the total Americas' net sales to unaffiliated customers for the three months ended April 30, 2016 and 2015. Total long-lived assets in the United States represented 95% of the Americas' total long-lived assets at both April 30, 2016 and January 31, 2016.

[2] Operating income in the Americas for the three months ended April 30, 2016 and 2015 includes a gain related to LCD settlements, net, of $0.4 million and $38.5 million, respectively (see further discussion in Note 1 – Business and Summary of Significant Accounting Policies).