Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Apr. 30, 2017	Apr. 30, 2016	Jan. 31, 2017
Segment Reporting Information
Net sales:		$ 7,664,063	$ 5,963,362
Operating income:		75,078	52,558
Stock-based compensation expense		(4,918)	(3,657)
Depreciation and amortization:		31,683	14,047
Capital expenditures:		30,446	11,563
Identifiable assets:		10,556,608		$ 7,931,866
Long-lived assets:		133,761		74,239
Goodwill & acquisition-related intangible assets, net:		1,802,150		279,298
Gain (Loss) Related to Litigation Settlement		12,688	443
Acquisition and integration expenses		42,066	0
Americas
Segment Reporting Information
Net sales:	[1]	3,468,837	2,388,004
Operating income:	[2]	50,900	31,275
Depreciation and amortization:		$ 16,692	$ 4,890
Sales to unaffiliated customers, as percentage of total sales		86.00%	88.00%
Capital expenditures:		$ 20,872	$ 6,097
Identifiable assets:		4,812,431		3,238,162
Long-lived assets:	[1]	71,539		35,581
Goodwill & acquisition-related intangible assets, net:		$ 1,138,400		$ 33,296
Long-lived assets, as percentage of total assets		92.00%		94.00%
Acquisition and integration expenses		$ 30,200
Europe
Segment Reporting Information
Net sales:		4,006,920	3,575,358
Operating income:	[3]	24,799	24,940
Depreciation and amortization:		13,533	9,157
Capital expenditures:		9,394	5,466
Identifiable assets:		5,263,064		$ 4,693,704
Long-lived assets:		56,803		38,658
Goodwill & acquisition-related intangible assets, net:		608,635		246,002
Acquisition and integration expenses		11,500
Asia-Pacific
Segment Reporting Information
Net sales:		188,306	0
Operating income:		4,297	0
Depreciation and amortization:		1,458	0
Capital expenditures:		180	$ 0
Identifiable assets:		481,113		0
Long-lived assets:		5,419		0
Goodwill & acquisition-related intangible assets, net:		$ 55,115		$ 0

[1] Net sales in the United States represented 86% and 88%, respectively, of the total Americas' net sales for the three months ended April 30, 2017 and 2016. Total long-lived assets in the United States represented 92% and 94%, respectively, of the Americas' total long-lived assets at April 30, 2017 and January 31, 2017.

[2] Operating income in the Americas for the three months ended April 30, 2017 includes a gain related to LCD settlements and other, net, of $12.7 million and acquisition and integration related expenses of $30.2 million (see further discussion in Note 3 - Acquisitions). Operating income in the Americas for the three months ended April 30, 2016 includes $0.4 million of a gain related to LCD settlements and other, net (see further discussion in Note 1 – Business and Summary of Significant Accounting Policies).

[3] Operating income in Europe for the three months ended April 30, 2017 includes acquisition and integration related expenses of $11.5 million.